# History

- v2.10 ‘Cowbell’, 15th April, 2016
- v2.9 ‘Venster’, 31st Dec, 2015
- v2.8 ‘Karlsruhe’, 20th Nov, 2015
- v2.7 ‘Rerezzed’, 10th Sept, 2015
- v2.6 ‘Algorave’, 30th July, 2015
- v2.5 ‘Craft’, 13th April, 2015
- v2.4 ‘Defrost’, 11th Feb, 2015
- v2.3 ‘Bitcrush’, 28th Jan, 2015
- v2.2 ‘Slicer’, 18th Dec, 2014
- v2.1 ‘Core’, 21st Nov, 2014
- v2.0 ‘Phoenix’, 2nd Sept, 2014

## Version 2.10 - ‘Cowbell’

Friday 15th April, 2016 (view commits)

“I gotta have more cowbell!” - The Bruce Dickinson

The main feature in this release is the completely new sample system for working with large folders of samples. You can now easily index into and filter over whole folders of samples with a simple yet powerful filter system. This system has been in development for over a year now and has been tuned and tweaked over many performances and practice sessions. See the documentation and examples for `sample` as well as the new tutorial section 3.7 for details.

We also have a number of exciting new sounds to play with including some beautifully sounding chiptune synths, fun retro FX and new drum samples including a full tabla set and a cowbell.

Finally, even more boot issues on both OS X and Windows that have been fixed making this the most polished and stable release to date.

Now go and get your live code on!

### Breaking Changes

- `use_sample_pack_as` and `with_sample_pack_as` have been removed.
- A synth opt value of `nil` now no longer resolves to 0.0. Instead it masks any defaults and ensures the downstream default (for the actual synthdef itself) is honoured. This allows you to override any existing synth defaults specified via `use_synth_defaults` for a given synth trigger.
- Default schedule ahead time is now 0.5s on all platforms for consistency (except for Raspberry Pi 1 which remains at 1s).

### New Fns

- `current_random_seed` - Get the current seed value of the random generator.
- `set_cent_tuning!` - global tuning.
- `on` - similar to `if` but behaves the same as the `on:` opt for synths and samples.
- `halves` - create a ring of successive halves.
- `doubles` - create a ring of successive doubles.
- `pick` - similar to shuffle but allows duplicates. You may also specify how many items to pick.
- `fx_names` - create a ring of all available FX.

### Synths & FX

- New synth `:dtri` - detuned triangle waves.
- New synth `:pluck` - a lovely synthesised plucked string.
- New synth `:chiplead` - retro NES style lead synth.
- New synth `:chipbass` - retro NES style bass synth.
- New synth `:chipnoise` - retro NES style noise synth.
- New FX `:whammy` - low-tech transposition effect similar to the Digitech Whammy guitar pedal.
- New FX `:octaver` - low-tech octave effect similar to early guitar pedals.
- New FX `:vowel` - modifies incoming signal to match human vowel sounds.
- New FX `:mono` - mono effect for summing stereo channels.
- `:tanh` FX is now more crunchy by default.
- `:compressor` and `:krush` FX now correctly honour the `mix:` opt.

### Samples

- Samples in FLAC format (Free Lossless Audio Codec) are now supported!
- The `sample` fn gained source and filter pre-opts. You may now specify a number of parameters directly before the opts which describe both folders containing samples and filters over those folders to allow you to easily and quickly work with large sample sets. See Section 3.7 of the tutorial for more information.
- Samplers now have `hpf:` and `lpf:` opts. Any `cutoff:` opts are automatically switched to `lpf:` and any errors will be reported with an `lpf:` prefix.
- The sampler synth gained a compressor enabled via the `compress:` opt. This means you can now compress any triggered sample directly without the need to reach for an FX.
- Samplers gained the `pre_amp:` opt which applies the amp at the beginning of its internal signal chain. You can use this to overload the new compressor.
- Samplers now have both high pass and low pass filter envelopes which behave similarly to the amplitude envelope but control internal hpf and lpf FX. These are available via new opts which mirror the standard envelope opts but with a `hpf_` and `lpf_` prefix (such as `hpf_attack`, `lpf_decay_level` and friends).
- Passing a directory path to `load_samples` will now load all the samples within that directory.
- Passing a directory path to `free_samples` will now free all the loaded samples within that directory.
- Samples are now loaded asynchronously in a separate thread. This therefore doesn’t block the current thread and cause any subsequent synth/sample triggers to be late.
- Sample trigger logging now includes the directory of the contained sample.
- Samples are now reloaded asynchronously after a server reboot (and therefore no longer block execution).
- Add new `:tabla_` sample group with a range of tabla drum sounds.
- Add new `:vinyl_` sample group with a range of vinyl scratches and hisses.
- Add new samples: `:drum_cowbell`, `:drum_roll`, `:misc_cros`, `:misc_cineboom`, `:perc_swash`, `:perc_till`, `:loop_safari`, `:loop_tabla`.

### GUI

- Add new preference to enforce strict synth/FX timing. When enabled synths and samples no longer trigger if it is too late - instead they are silent and print a warning message. This behaviour ensures samples or synths are never triggered out of time.
- New load button which will load the contents of a file into the current buffer.
- The vertical bars which help visualise nesting now render in a contiguous fashion over blank lines.
- `C-k` now nukes over trailing whitespace.
- `load_sample` now has sample autocompletion.
- GUI now correctly reports if the host is a Raspberry Pi 3.
- New editor preference - Log Auto Scroll. When enabled will always scroll log to the bottom after printing every new message.
- Whitespace at top and bottom of buffer is no longer trimmed.
- Hitting `RETURN` now auto-indents the buffer - ensuring that the cursor is moved to the correct indentation on the following line.
- Added Chinese Simplified GUI translation.
- Log visibility now correctly matches GUI preference.

### Documentation

- New tutorial section 3.7 on Sample Pack Filters.
- New appendix sections.
- Examples for `sample` fn have been completely rewritten and extended.

### Improvements

- `scale` and `chord` can now handle being passed no tonic such as: `(chord :minor)` which will return a ring of offsets from 0.
- `chord` learned new variants: `add2`, `add4`, `add9`, `add11`, `add13`, `madd2`, `madd4`, `madd9`, `madd11`, `madd13`
- The ring’s `.take` method can now take more elements than the original ring by wrapping around: `(ring 1, 2, 3).take(5) #=> (ring 1, 2, 3, 1, 2)`
- Rings may now be added or subtracted from each other e.g. `(ring 1, 2, 3) + (ring 4) #=> (ring 1, 2, 3, 4)`
- Adding or subtracting a number from a ring will create a new ring with the number added or subtracted from each of the original ring’s elements: `(ring 1, 2, 3) - 1 #=> (ring 0.0, 1.0, 2.0)`
- Calling `(ring 1, 2, 3).take(0)` will now return an empty ring.
- `density` now complains if it isn’t passed a do/end block.
- Improve error messages for `use/with_synth` when accidentally passed opts.

### Bugfixes

- On OS X only raise an error on boot if it’s clear the sound card’s in and out rates are different.
- Improve robustness of boot process on Windows.
- Rest notes are no longer printed if synth logging is disabled.
- No longer apply synth defaults to FX.
- You may now control opts that have no associated info (previously it would raise a ‘not modulatable’ error).
- Fix index lookup of Vectors.
- Fix `C-i` doc lookup shortcut to work with `:tb303` synth docs.
- `C-i` now always displays docs where available (previously it was possible for docs not to be displayed).
- Sliding between chords now works correctly
- Windows version will now boot mutiple networked machines logged in with the same account.

## Version 2.9 - ‘Venster’

Thursday 31st December, 2015 (view commits)

Hot on the heels of the previous release comes `v2.9` codenamed `Venster` (Dutch for window). This release has a specific focus on fixing all the known issues with Sonic Pi running on Windows. If you’ve tried Sonic Pi on Windows before and had issues, make sure to try it again with `v2.9`. If you’re still having issues on Windows please do let us know so we can fix it as soon as possible.

For all you Raspberry Pi and Mac OS X users - you’re not left out. Sonic Pi is just as stable as it was before (if not more stable) and `v2.9` comes with a surprising amount of tweaks and features for its short 1 month development cycle. There’s two new FX to play with: `tanh` and `gverb` as well as a heavily revamped logging system which is much clearer about printing which opts are actually being used for your synths and samples. Finally, we now include of all the published MagPi magazine articles in the tutorial. We also now have Hungarian and Norwegian translations of the GUI.

Happy Live Coding!

### Breaking Changes

- Rename fn `invert_chord` to `chord_invert`
- Sampler no longer mixes `rate:` and `pitch_stretch:` opts. It’s now possible to set the `rate:` independent of the `pitch:` modification caused by `pitch_stretch`.

### New Fns

- `block_duration` - returns the duration of the given block in seconds (not scaled with the BPM).
- `block_slept?` - returns true if the contents of the block slept or synced.
- `synth_names` - returns a list of all the available synths
- `reset_mixer!` - resets the main mixer back to its default values.
- `sample_free` - unload a sample from memory to free up memory usage.
- `sample_free_all` - unload all samples from memory.
- `use_octave` - similar to `use_transpose` but for whole octaves.
- `with_octave` - similar to `with_transpose` but for whole octaves.
- `use_merged_sample_defaults` - similar to `use_merged_synth_defaults` but for samples
- `with_merged_sample_defaults` - similar to `with_merged_synth_defaults` but for samples
- `use_cent_tuning` - uniformly tune all subsequent notes in cents
- `with_cent_tuning` - uniformly tune all notes in cents within the block

### Synths & FX

- New FX `tanh` - for more distortion goodness.
- New FX `gverb` - a different reverb FX to play with.

### GUI

- Synths and samples now also log defaults set by `use_synth_defaults` and friends.
- Opts are logged in the order they were defined with local opts first followed by inherited opts.
- BPM scaling is now accounted for in logging vals.
- Log metadata such as run number and time is now printed in a more code-like way: as a hash of key value pairs.
- `C-k` will now kill multiple lines if lines end with `,`.
- When saving a buffer a `.txt` extension is automatically added to the file name if none specified.
- Add Hungarian and Norwegian translations of GUI.
- Add Spanish translation of tutorial.
- Add title to main window - enables Sonic Pi to be selected in screensharing app lists such as Google Hangouts and OBS.
- Add autocompletion for tuning systems.

### Documentation

- Add 8 complete MagPi magazine articles to the tutorial in appendix A.
- Add new example ‘ambient experiment’ by Darin Wilson.
- Add new example ‘chord inversions’ by Adrian Cheater.
- Change tutorial license to CC-BY-SA 4.0.
- Add instructions for compiling and building on Windows.
- Many, many minor tweaks and improvements.

### Improvements

- Add `sync:` opt to `live_loop` and `in_thread`. This now syncs the live loop once on creation. Similar to the `delay:` opt. If both `sync:` and `delay:` are specified then the delay happens before the sync.
- The `synth` fn can now play chords with the `notes:` opt such as: `synth :dsaw, notes: (chord :e3, :minor)`. This will return a single controllable synth node representing all the notes similar to `play_chord`.
- BPM scaling and other normalisation is now honoured when controlling nodes
- The `on:` opt is now honoured when playing chords.
- Samplers sound signal now bypasses filter envelope when not used.
- It is now possible to use externally defined FX synths by passing a string as the FX name: `with_fx "my_shiny_effect"`. This needs to be loaded manually via `load_synthdefs`.
- OS X now supports rates other than 44.1k provided they are similar for both audio in and out.
- Run code in `~/.sonic-pi/init.rb` on launch if it exists.
- If environment variable `SONIC_PI_HOME` is set it will be used over `~` as the root of the user’s `.sonic-pi` directory (used to auto-save files and store logs).
- Default sound card selection is now honoured on Raspberry Pi - so you may now use your IQaudIO hat (or similar) out of the box.

### Bugfixes

- Fix number of synth validation errors.
- Fix sporadically failing boot issues on Windows
- Add auto-reboot functionality for audio server. This now detects errors in the server (such as a killed or zombied process) and automatically reboots it to enable Sonic Pi to continue without a full restart. Reboots automatically reload all loaded samples and synthdefs.
- `sample_duration` now correctly takes account of TL defaults set by `use_sample_defaults`.
- Sampler opts `pitch_stretch`, `beat_stretch` and `rpitch` can now be used in TL defaults.

## Version 2.8 - ‘Karlsruhe’

Friday 20th November, 2015 (view commits)

This release, named after Karlsruhe, one of the home cities of live coding, is mainly a maintenance release with a strong focus on both performance, stability and documentation. This is therefore the fastest and most stable release of Sonic Pi ever with a massive 10% performance improvement on the original Raspberry Pi 1. It also ships with new translations in Polish, Japanese and French. Many of these improvements (such as the complete rewrite of the OSC stack) are not documented in this release list but can instead be found in the commit logs over on Github.

However, not to go unnoticed are a number of exciting new features. For example we now have a new Band EQ FX, the ability to use MIDI note names such as `:e5` as values for opts such as `cutoff:`, and new powerful cutoff envelopes on the sampler.

### Breaking Changes

- Shortcuts for switching buffers have changed. They are now `M-{` and `M-}` for switching left and right respectively.
- `sync` no longer inherits BPM by default. Set the `bpm_sync:` opt to true to enable BPM inheritance.
- Random seed generation for new threads is now reset on calls to `use_random_seed`.

### New Fns

- `octs` - returns a ring of successive octaves.
- `assert` - for raising an exception if the argument is not true.
- `assert_equal` - for raising an exception if the two arguments are not equal.
- `bt` - converts the specified time w.r.t. the current BPM.
- `inspect` - similar to `print` but prints the inspected version of the argument.

### GUI

- New translations for Polish, Japanese and French.
- Improve efficiency of logging panel.
- `M-RET` is now a duplicate shortcut for running the code.
- Log title bar is now hidden in full-screen mode.
- Log - don’t display └ or ├ if the line is blank, instead display │
- Add sample name autocompletion to more fns such as `sample_duration`.

### Documentation

- New tutorial section on ring chains (chainable functions for modifying rings)
- Tilburg 2 example slightly tweaked for Raspberry Pi 1 compatibility.
- Many minor tweaks and improvements in all areas.

### Synths & FX

- New FX - Band EQ for attenuating or boosting a specific frequency band.
- New synth - DPulse - a detuned pulse wave.
- Sampler now has a cutoff envelope which can be accessed via new opts which mirror the standard envelope opts but with a `cutoff_` prefix (such as `cutoff_attack`, `cutoff_decay_level` and friends).
- Sampler now correctly handles samples with different sample rates.
- Bitcrusher FX now has an internal low pass filter modifiable via a new `cutoff` opt.
- Panslicer now correctly honours min and max pan values.
- New default opt `on:` for both `sample` and `synth`. This acts like `if` but ensures all the opt vals are evaluated (useful if wanting to keep the consumption of random streams or ticks consistent even when not triggering a synth.
- MIDI opts such as `cutoff:` can now accept note names such as `:c4`.
- FX learned the global `slide:` opt to match synths.

### Improvements

- Massive performance improvements.
- Teach `play_pattern_timed` to handle rings.
- `current_transpose` now returns 0 if there is no current transposition.
- BPM scaling is now honoured when controlling synths and FX
- All `with_fx*` fns now return the result of their block.
- `spark` now handles rings correctly.
- `spark` now treats booleans as 1s and 0s so you can now spark rings of bools.
- `puts`, `print` and `mc_message` now handle multiple message arguments

### Bug Fixes

- Ensure `with_fx` doesn’t swallow TL modifications such as transposition, current synth etc.
- Ensure `with_fx` doesn’t affect random seed.
- Improve reliability of boot process on Mac and Windows.
- The FX `pre_amp:` opt is no longer scaled w.r.t. the current BPM.
- Fixed GUI side of update checking system.

## Version 2.7 - ‘Rerezzed’

Thursday 10th September, 2015 (view commits)

This release brings a substantial change to the random number generator. This has the unfortunate side effect of breaking backwards compatibility. If you have been using `rand`, `choose`, `shuffle` and friends to create predictable patterns for your riffs, your code will produce different results in this release. Please let me apologise and say it’s for a good cause. So what is this good cause? Well, you can now jump backwards and forwards through the random stream giving you way more creative control than before! The random stream is now also unified with the random stream on the synthesis server allowing you to sync behaviour between synths and code. Exciting times.

The sampler has also been super charged. We can now easily change the rate via MIDI note intervals with `rpitch:` and stretch the sample whilst preserving pitch via `pitch_stretch:` (although with variable results `;-)`).

Finally you can now control the global mixer with `set_mixer_control!` for those full filter sweeps over the entire sound…

Have fun and happy live coding!

### Breaking Changes

- Complete rewrite of random number system. This means if you’ve been combining calls to `use_random_seed` with randomisation to create predictable melodies/rhythms/timbral manipulations you will unfortunately get different results in `v2.7`. This change is to synchronise both the Ruby rand stream with the one in SuperCollider as well as enabling the reversal of calls to rand via `rand_back`.
- `sync` now causes the BPM to be inherited from the thread calling the matching `cue`. This may be disabled with the new `bpm_sync:` opt.
- `rrand` and `rand` now return 0 if called with 0.
- `invert_chord` now handles negative inversions in a more musically appropriate manner..

### New Fns

- `ratio_to_pitch` which provides the inverse of `pitch_to_ratio`
- `midi_notes` - returns a ring of numbers (mapping the source ring/array through the fn `note`).
- `rand_back` - reverse the random stream and ‘undo’ calls to `rand`
- `rand_skip` - skip forward through the random stream.
- `rand_reset`- reset the random stream to the last seed.

### GUI

- It is now possible to toggle the commenting of whole selections or individual lines with the shortcut `M-/`.
- Added Icelandic translation.

### Synths & FX

- All synths learned the `decay_level` opt to allow the sustain phase to shift between two distinct values. The default value for `decay_level` is to mirror `sustain_level:` thus preserving current behaviour.
- `play` and `synth` have now learned the `pitch:` opt to match `sample`. This just increments or decrements the final note.
- `sample` now correctly validates opts.
- `sample` learned the `pitch_stretch:` opt which combines `rate:` modification (similar to `beat_stretch:` with `pitch:`. Attempts to maintain the pitch whilst simultaneously changing the rate. The underlying implementation is very basic and can easily destroy the sound.
- `sample` learned the `rpitch:` opt for simple rate pitch modulation. This modifies the rate to match the specified number of MIDI notes relative from the current pitch. For example, a `rpitch:` of 12 would double the rate.
- The unit of the FX `:echo`’s `decay:` opt is now beats and the value is scaled with the BPM.

### Examples

- Most examples have been tweaked to sound good with the new random generator.
- Tilburg has been replaced with Tilburg 2. Play it and get your Algorave on!

### Improvements

- Auto-align code on Run.
- `live_loop` learned the `seed:` opt which will set the new thread with the specified seed prior to initial run.
- Add check to ensure BPM is a positive value.
- `density` has now been taught to handle values between 0 and 1 which will now stretch time for the specified block.
- Errors now no longer print out crazy print version of context object i.e. #
- Both `in_thread` and `live_loop` have now learned the `delay:` opt which will delay the initial execution by the specified number of beats.
- Buffer and thread name are now printed on error.
- `sample_duration` now understands all the opts that you can pass to `sample`
- It is now possible to do basic arithmetic on symbols representing rests: `:r + 3` returns `:r` (a rest plus any MIDI note shift is still a rest).

### Bug Fixes

- Fixed crash when synth args were specified as Rationals.
- `note_info` now correctly handles octaves.
- Fix windows paste shortcut `C-v`.
- Teach `invert_chord` how to properly handle out of range index ranges.

## Version 2.6 - ‘Algorave’

Thursday 30th July, 2015 (view commits)

The laser beams sliced through the wafts of smoke as the subwoofer pumped bass deep into the bodies of the crowd. The atmosphere was ripe with a heady mix of synths and dancing. However something wasn’t quite right in this nightclub. Projected in bright colours above the DJ booth was futuristic text, moving, dancing, flashing. This wasn’t fancy visuals, it was merely a projection of Sonic Pi running on a Raspberry Pi. The occupant of the DJ booth wasn’t spinning disks or playing MP3s, she was writing, editing and evaluating code. She was live coding and this was an Algorave.

This release is codenamed Algorave to celebrate that Sonic Pi is now ready to be performed within nightclubs as well as still being a fantastic tool for learning how to code creatively. There are many improvements as detailed below. However, let’s just take a brief look at some of the most fun. Firstly we have the new error reporting system to make it easier to find and debug your errors. Syntax errors are now blue and runtime errors pink. We also have a new look and feel including a new dark mode for performing in dark places. We also have some fantastic new synths, FX and have even improved the standard synths. For example, `sample` now lets you stretch to match the beat with the `beat_stretch:` opt and change pitch with `pitch:`. The `slicer` FX now sports a fantastic deterministic `probability:` opt for creating and manipulating rhythmic structures with ease. Finally there’s the new thread local `tick`/`look` system which will revolutionise the way you work with `ring`s within `live_loop`s. Of course there’s so much more too!

Enjoy this release and happy Algoraving!

### Breaking Changes

- The `res:` opt for all synths and FX now has range 0->1 rather than 1->0. This means that a higher res value results in more resonance. This will hopefully be more intuitive to beginners and less surprising for people with existing synth knowledge.
- The fn `stop` has been renamed to `kill` for killing specific synths. In its place a new fn `stop` has been added to stop a given thread or `live_loop`.
- `invert_wave` opts are now inverted. The default is now 0 which has the same behaviour as the old 1. This means that it’s more intuitive to use the opt as to invert the current wave, you now specify: `invert_wave: true`, rather than `invert_wave: false`. This shouldn’t affect any code which doesn’t explicitly set the `invert_wave:` opt. Pieces which have explicit inversion need to swap all 0s for 1s and vice versa.
- The `res:` opt for `rrand` and `rdist` has been renamed to `step:` to avoid confusion with the resonance opt for cutoff filters.
- Rename `pitch_ratio` to `pitch_to_ratio` to keep in line with other similar fns such as `midi_to_hz`.

### New Fns

- New thread-local (i.e. live_loop local) counter system via fns `tick` and `look`.
- New fn `vector` which creates a new kind of Array - an immutable vector (`SPVector`) which is now the default base class for all rings.
- New fns `use_sample_defaults` and `with_sample_defaults` which act similarly as their `*_synth_defaults` counterparts but for samples not synths.
- New fns `use_tuning` and `with_tuning` for exploring other tuning systems such as `:just`, `:pythagorean`, and `:meantone`.
- New fn `invert_chord` for chord inversions.
- New fn `current_beat_duration` for returning the duration of the current beat in seconds.
- New fn `note_range` for returning a range of notes between two notes with a `pitches:` opt for constraining the choice of filler notes.
- New fns `scale_names` and `chord_names` for returning a ring of all chords and scales.
- New example `rerezzed` - strongly influenced by Daft Punk’s track `derezzed`.
- New example `reich phase` - a nice way of combining `live_loop`s and `tick` to create sophisticated polyrhythms.
- New fns `use_cue_logging` and `with_cue_logging` for enabling and disabling the logging of `cue` messages.

### GUI

- New visual look and feel including a new Dark Mode for live coding in night clubs.
- New preferences for hiding/showing aspects of the GUI such as the buttons, log, tabs etc.
- New preference for full screen mode.
- Improve error message reporting. Syntax errors are now made distinct from runtime errors with colour-coded messages. Also, the line number of the error is much more visible, and the line of the error is highlighted with an arrow in the left-hand margin.
- Workspaces are now named buffers. This is a smaller word which works better on lower res screens and is also a lovely term used by a number of wonderful programming editors such as Emacs.
- Print friendly messages to the log on boot.
- Add pref option to check for updates now.

### Synths & FX

- New FX - `krush` for krushing the sound.
- New FX - `panslicer` similar to `slicer` and `wobble` but modulates the stereo panning of the audio.
- New synth `subpulse` for a full range pulse with extra bass.
- New synth `blade` - a moody Blade Runner-esque synth violin
- New synth `piano` - a basic piano emulation. Only capable of whole notes.
- FXs `slicer` and `wobble` now have a wonderful new `probability:` opt which will only slice on (or off depending on wave inversion) with the specified probability. The behaviour is deterministic, so repeated calls with the same `seed:` and `probability:` opts will result in the same behaviour. Great for adding interesting rhythmic variation to sound.
- FXs `slicer` and `wobble` now have smoothing opts for even more control over the resulting wave form.
- Teach `sample` the opt `beat_stretch:` for modifying the rate of the sample to make sure the duration of the sample is n beats long (with respect to the current bpm). Note: stretching the beat does change the pitch.
- Teach `sample` the opt `pitch` to enable pitch shifting on any sample.
- FX `flanger`’s feedback mixing is now more fair and is less likely to hike up the amplitude.

### Improvements

- Teach `note_info` to also handle a number as its param.
- Teach `factor?` to handle division by 0.
- Teach `load_sample` to throw exception when passed an empty path.
- Now throws an exception when you attempt to create an empty ring.
- Rings are now immutable (in the Clojure sense) which means they can be safely passed to multiple threads/live_loops without any issues.
- Teach `use_sample_bpm` the opt `num_beats:` to indicate that a given sample consists of a specific number of beats.
- Teach `comment` and `uncomment` to require blocks.
- Teach synth chord groups to allow their notes to be controlled individually to allow transitions between chords.
- Throw nicer exception when unable to normalise synth args
- Teach `chord` the new opt `invert:` as a shortcut to the new `invert_chord` fn.
- Teach `sample_duration` about the opts `start:` and `finish:` and envelope opts such as `attack:` and `release:`. This allows you to replace any call to `sample` with `sample_duration` to get the exact duration of that call.
- Teach `chord` the opt `num_octaves` to enable the easy creation of arpeggios.
- It is now possible to set the block type in the Minecraft API.

### Bug Fixes

- Fix bug in `with_sample_pack_as` to now correctly accept a block.
- `mc_surface_teleport` no longer throws an error.
- `Array#shuffle` now works correctly with the random seeds for deterministic behaviour.
- Fix broken behaviour with multiple nested calls to `*_sample_bpm`.

## Version 2.5 - ‘Craft’

Monday 13th April, 2015 (view commits)

This release comes with support for Minecraft: Pi Edition installed on the Raspberry Pi. You can now create music with Minecraft visuals or even code up a synth score in Minecraft blocks and read and play the score from Sonic Pi! Another exciting aspect of this release is much improved editor functionality for navigating around and manipulating code via keyboard shortcuts. This means that live coding just got a lot more fun. The keyboard shortcuts are based on the standard shortcuts provided by GNU Emacs - the oldest and most powerful text editor in use by wizard programmers today.

### Breaking Changes

- `invert_wave` now defaults to 1 everywhere. I found I always inverted the wave every time I used a synth/fx where wave inversion was key. This seemed like such a better default I’ve broken compatibility for it. Apologies if this has affected you.
- The `flanger` FX now defaults the optional arg `stereo_invert_wave` to 1.
- Renamed FX `ring` to `ring_mod` to reduce the potential for confusion with the `ring` datastructure.
- `Tab` now indents current line or selection rather than inserting a useless tab character.

### New

- Support for programming Minecraft Pi Edition.
- `sync` now accepts multiple cue ids and will sync on the first matching id.
- New fn `pitch_ratio` for converting a midi note to a frequency ratio. Useful for tuning samples.
- New fn `line` for creating a line from start to finish with a specific number of slices.
- New fn `spark` for displaying lists of numbers in a fancy text-graph (`▁▃▅▇`) in the log.
- On stop, amplitude of output slides down over 1s to silence for a smoother transition.
- `sample_duration` now scales result based on current BPM.
- `range` now accepts optional args: `inclusive:` and `step:`.

### GUI

- German translation of GUI and tutorial. Simply open Sonic Pi with a machine with a German localisation setting.
- Display GUI fully maximised when opening for first ever time.
- Workspace indexing now starts at 0 to match standard programming indexes.
- New shortcuts - `M-<` and `M->` for switching workspaces.
- Many new Emacs-based code navigation and editing shortcuts. See the shortcut cheatsheet in the built-in tutorial for more information.
- Increase height of doc and error panes.
- Improve error pane colour scheme.
- Auto-align now trims whitespace from start and end of buffer.
- Add preference toggle to hide/show line numbers.
- Documentation now supports semantic formatting and highlighting.
- Docsystem tabs are now positioned at the bottom for better navigation.
- New preference to hide/show line numbers in editor.

### Synths & FX

- New FX - `:pitch_shift`

### Bug Fixes

- Fix OSC lib to properly encode multibyte chars such as UTF8
- Fix sporadic issue on some platforms when trigging percussive sounds within a `reverb` FX caused a serious audio overload.
- Add missing fn metadata for `*_sample_bpm`
- Fix synth metadata for FX `:bpf`.
- Fix arg metadata for `use_sample_pack_as`
- Rings now pretty print themselves as `(ring 1, 2, 3)` rather than `[1, 2, 3]`.
- `C-k` keyboard shortcut now copies text into the clipboard.
- Scales and chords now return actual `ring`s rather than `ring`-like things.
- Improve Ring Mod FX arguments
- Exceptions created within `with_fx` are now raised correctly.

## Version 2.4 - ‘Defrost’

Wednesday 11th February, 2015 (view commits)

A quick release following `v2.3` to address an issue with the GUI freezing on specific CPUs. However, although this release has had a small development cycle, it ships with three fantastic features. Firstly we now have the `spread` fn which provides an amazing way to create interesting rhythms with very little code. Secondly we can now use `cutoff:` on any sample massively increasing their timbral range and finally we have three exciting new synths for you to play with. Have fun!

### Breaking Changes

- Unfortunately 5 pre-release synths accidentally slipped into v2.3. Three of them have been polished up and are in this release (one with major changes including a name change). However, the other two have been removed.

### New

- New fn `spread` for creating rings of Euclidean distributions. Great for quickly creating interesting rhythms.
- GUI now automatically appends a `:` to the FX opt autocomplete list
- Synths and FX now raise an exception if any of their non-modulatable opts are modulated. This is disabled when the pref ‘check synth args’ is unchecked.
- GUI now renders pretty UTF-8 `└─` `├─` characters when printing in the log on RP.
- Improve docstrings for sample player.

### Synths & FX

- New Synth `:dark_ambience`, an ambient bass trying to escape the darkness.
- New Synth `:hollow`, a hollow breathy sound.
- New Synth `:growl`, a deep rumbling growl.
- Sampler synths now sport built-in `rlpf` and `normaliser` FX. These are disabled by default (i.e. won’t affect sound of the sample) and can by enabled via the new `cutoff:`, `res:` and `norm:` opts.

### Bug Fixes

- Fix insanely obscure bug which caused the GUI to freeze on certain platforms (32 bit Windows and RP2 with 2G/2G kernel).
- Remove DC Bias offset from Prophet synth (see http://en.wikipedia.org/wiki/DC_bias)

## Version 2.3 - ‘Bitcrush’

Wednesday 28th January, 2015 (view commits)

### Breaking Changes

- Playing chords with the fn `chord` now divides the amplitude of each resulting synth by the number of notes in the chord. This ensures the resulting amplitude isn’t excessive and is normalised.
- Chords now evaluate their args once and those args are used for all synth triggers. This means random values are only generated once and are similar across all notes in the chord. Previous behaviour can be obtained by calling play multiple times with no interleaved sleeps.
- Ensure each new thread’s random number generator is unique yet seeded in a deterministic manner. This stops random vals across `at` from being identical.
- `range` is now exclusive: `(range 1, 5) #=> (ring 1, 2, 3, 4)`

### New

- New fn `density` for compressing and repeating time Dr Who style. For example, wrapping some code with a call to density of 2 will double the bpm for that block as well as repeating it twice. This ensures the block takes the same amount of time to execute while doing double the work.
- New fns `with_bpm_mul` and `use_bpm_mul` which will multiply the current bpm by a specified amount. Useful for slowing down and speeding up the execution of a specific thread or live_loop.
- New fn `rdist` - generate a random number with a centred distribution
- New examples: `square skit`, `shufflit` and `tilburg`

### Improvements

- Teach control to ignore nil nodes i.e. `control nil, amp: 3` will do nothing.
- Teach Float#times to yield a float to the block. For example, `3.4.times {|v| puts v}` will yield `0.0`, `1.0` and `2.0`.
- Synth, Sample and FX args now handle bools and nil correctly. `true` resolves to `1.0` and `false`, `nil` resolve to `0.0`. This allows you to write code such as: `play :e3, invert_wave: true`
- Teach `at` to handle varying block arities differently. See docs for more detail. Original behaviour is preserved and only extended.
- App now checks for updates (at most once every 2 weeks). This may be disabled in the prefs.
- Teach `:reverb` FX to extend its kill delay time with larger room sizes to reduce the chance of clipping.

### Synths & FX

- New FX `bitcrusher` - for crunching and destroying those hi-fi sounds.
- New FX `flanger` - a classic swhooshing effect typically used with vocals and guitars.
- New FX `ring` - ring modulation for that friendly Dalek sound
- New FX `bpf` - a band pass filter
- New FX `rbpf` - a resonant band pass filter
- New FX `nbpf` - a normalised band pass filter
- New FX `nrbpf` - a normalised resonant band pass filter

### New Samples

- `perc_snap` - a finger snap
- `perc_snap2` - another finger snap
- `bd_ada` - a bass drum
- `guit_em9` - a lovely guitar arpeggio over Em9

### Bug Fixes

- Namespace `live_loop` fn and thread names to stop them clashing with standard user defined threads and fns.
- GUI no longer crashes when you start a line with a symbol.
- `with_fx` now returns the result of the block
- Kill zombie scsynth servers on startup for better crash recovery.
- Handle paths with UTF8 characters gracefully
- Force sample rate for output and input to 44k on OS X. This stops scsynth from crashing when output and input sample rates are different.

## Version 2.2 - ‘Slicer’

Thursday 18th December, 2014 (view commits)

This release brings a number of nice enhancements. However the main feature is the accurate timing for triggering FX. This means you can now reliably use FX for accurate rhythmic purposes such as wobbling, slicing and echoes.

### Breaking Changes

- `use_sample_pack_as` now uses a double underscore `__` as a separator between the user-specified alias and the sample name.

### API Changes

- Teach synth args to take prefixed maps: `play 50, {amp: 0.5}, {release: 2}, amp: 2`
- Don’t round Floats when user specifically prints them to log with puts
- `with_fx` FX synths are now triggered using virtual time rather than real time. This means that FX can now be used for rhythmical purposes.
- Work on new `RingArray` datastructure. This is essentially an array that wraps its indexes so you can use indexes larger than the array size.
- New fn `ring` - `(ring 1, 2, 3)` creates a new ring array.
- New fn `knit` - `(knit :a1, 2, :c1, 1)` returns `(ring :a1, :a1, :c1)`
- New fn `bools` - `(bools 1, 0, 1)` returns `(ring true, false, true)`
- New fn `range` - `(range 70, 100, 10)` returns `(ring 70, 80, 90, 100)`
- New fn `sample_loaded?` - to detect whether a specific sample has been loaded

### Synths & FX

- Fixed regression in `:tb303` synth - sound is reverted to v2.0 behaviour
- New Synth - `:square` - Pure square wave

### GUI

- Help system now autodocks on close
- Preferences are now remembered across sessions
- On Raspberry Pi, previous volume and audio output options are forced on boot.

### New Samples

- `bd_tek` - Bass drum

### Bug fixes

- `one_in` now returns false if num is < 1
- Ensure `live_loop`’s no-sleep detector works within nested `with_fx` blocks
- `chord` now returns a ring.

## Version 2.1.1

Tuesday 25th November, 2014 (view commits)

- Windows version no longer needs special firewall exceptions to run
- Added license information to info window
- Minor grammar and spelling tweaks to tutorial

## Version 2.1 - ‘Core’

Friday 21st November, 2014 (view commits)

The focus of release is very much on technical improvements, efficiency and general polish.

The most obvious and exciting change is the introduction of the `live_loop` which will change the way you work with Sonic Pi. For more information on `live_loop` take a look at the new section in the tutorial. Another very exciting development is that v2.1 marks the official support for Windows thanks to the excellent work by Jeremy Weatherford. Finally, this release is also the first release where Sonic Pi has a Core Team of developers. Please give a warm welcome to Xavier Riley, Jeremy Weatherford and Joseph Wilk.

### API Changes

- New fn `live_loop` - A loop for live coding
- New fn `inc` - increment
- New fn `dec` - decrement
- New fn `quantise` - quantise a value to resolution
- New fn `factor?` - Factor test
- New fn `at` - Run a block at the given times
- New fn `degree` - for resolving a note in a scale by degree such as `:i`, `:iv`
- New fn `chord_degree` - Construct chords based on scale degrees
- New TL fn `use_sample_bpm` - for changing the BPM based on a sample’s duration
- New fn `rest?` - Determine if note or args is a rest
- New fn `vt` - Get virtual time
- New fn `set_control_delta!` - Set control delta globally
- `wait` now handles both `sleep` and `sync` functionality
- Allow first arg to `play` to be a proc or lambda. In which case simple call it and use the result as the note
- Teach `play` to accept a single map argument (in which case it will extract `:note` key out if it exists.
- Fns `play` and `synth` now treat ‘notes’ `nil`, `:r` and `:rest` as rests and don’t trigger any synths.

### GUI Modifications

- Updated and improved tutorial
- Much improved autocompletion
- Add HPF, LPF, mono forcer and stereo swapping preferences to new studio section for use when performing with Sonic Pi through an external PA.
- Shortcuts overhauled - now supports basic Emacs-style Ctrl-* navigation.
- Shortcuts Alt-[ and Alt-] now cycle through workspaces
- Shortcuts now work when toolbar is hidden
- Font sizes for individual workspaces are now stored between sessions
- Ctl-Mouse-wheel zooms font on Windows
- Links are now clickable (opening external browser)
- Entries in docsystem’s synth arg table are now clickable and will take focus down to arg documentation
- Stop users accidentally clearing entire workspace if they type quickly after hitting run
- Hitting F1 or `C-i` over a function name now opens up the doc system at the relevant place

### Bugs/Improvements

- Reworked examples.
- Much improved efficiency in many areas - especially for Raspberry Pi.
- Avoid occasional clicking sound when stopping runs
- Note Cb is now correctly resolved to be a semitone lower than C
- Non RP systems now start with more audio busses (1024)
- Array#sample and Array#shuffle are now correctly seeded with thread local random generator
- Log files are now placed into ~/.sonic-pi/log
- Chords and scales now wrap around when accessed from indexes outside of their range.
- `rand_i` and `rrand_i` now correctly return integers rather than floats
- rrand arguments now correctly handle a range of 0 (i.e. min == max)
- Line offset in error messages is now correct
- When saving files on Windows, CRLF line endings are used
- Stop users defining functions with same name as core API fns

### Synths, Samples & FX

- New samples (bass drums, snares and loops)
- Allow `mod_range:` opt to have negative values (for oscillating with lower notes)
- Change slide mechanism to default to linear sliding with support for changing the curve type. All modifiable args now have corresponding `_slide_shape` and `_slide_curve` args.
- Improve TB303 synth - now supports separate cutoff ADSR envelopes. New opts:
  - `cutoff_attack:`,
  - `cutoff_sustain:`,
  - `cutoff_decay:`,
  - `cutoff_release:`,
  - `cutoff_min_slide:`,
  - `cutoff_attack_level:`,
  - `cutoff_sustain_level:`,
  - `cutoff_env_curve:`

## Version 2.0.1

Tuesday 9th September, 2014 (view commits)

- Fix recording functionality
- Improve documentation content and layout
- Close off OSC server from external clients
- Add History, Contributors and Community pages to info window
- Improve startup speed on OS X
- Re-work and add to shortcuts for key actions:
  - on RP they are all `alt-*` prefixed
  - on OS X they are all `cmd-*` prefixed
- Improve highlighting of log messages (`cue`/`sync` messages are more clearly highlighted)
- Log now communicates when a run has completed executing
- Fix bug encountered when stopping threads in super fast loops (stopped comms with server)

## Version 2.0 - ‘Phoenix’

Tuesday 2nd September, 2014 (view commits)

- Complete rewrite since v1.0
- Support for Live Coding - redefining behaviour whilst music is playing
- New timing system - timing now guaranteed to be accurate
- Many new synths
- New chainable studio FX system
- Support for sample playback
- Inclusion of over 70 CC0 licensed samples from http://freesound.org
- Support for controlling and modifying synth, fx and sample playback arguments after they have been triggered
- Completely re-designed GUI
- Help system with full documentation, tutorial and many examples
- Record functionality (for recording performances/pieces)
- Support for controlling system audio settings on RP