Changelog: fix reference to sample_loaded?
Fix bug in Buffer - @server is an instance var
Teach Buffer#free to return self
Whitespace fix
Teach normalise_args! to handle bools and nil:

* Synths args now auto-convert bools/nil to 1.0/0.0

  with_fx :slicer, invert_wave: true do
    synth :prophet, release: 8
  end