added new parameters to pitchtoy to make multiple simultaneous pitch shift
adding 5 voices and refactoring as I go...
refactoring/renaming stuff
this should give 4 independently controlled pitchshifts!
refactor for consistent naming
separate returns for each of the 5 grains
missing feedback param - plumbing not totally sorted...
I've been too hacky/wasteful to get loads of grains but this is cool!
this small optimisation allows 4 pitches at once!