# Merge synth defaults

``

    use_merged_synth_defaults

Specify synth arg values to be used by any following call to play. Merges the specified values with any previous defaults, rather than replacing them.

Introduced in v2.0

## Examples

# Example 1
``
    play 50

    use_merged_synth_defaults amp: 0.5
    play 50

    use_merged_synth_defaults cutoff: 80
    play 50

    use_merged_synth_defaults amp: 0.7
    play 50
| ``
    #=> Plays note 50

    #=> Plays note 50 with amp 0.5

    #=> Plays note 50 with amp 0.5 and cutoff 80

    #=> Plays note 50 with amp 0.7 and cutoff 80
# Example 2
``
    use_synth_defaults amp: 0.5, cutoff: 80, pan: -1
    use_merged_synth_defaults amp: 0.7
    play 50
| ``
    #=> Plays note 50 with amp 0.7, cutoff 80 and pan -1