Remove unused variable
Create 'Patch' and 'Signal' modules, and make 'system' a singleton. Refactor all the things.
Rename instrument's "scale" property to "notes" in preparation for using a better music library.
Triggers now store 'notes', which should allow you to change the pitch of oscillator after instantiation.
Hack in some keydown listeners for testing (and fun)
Narayan is a lifesaver