Platform: Mac Simulator
The documentation for the setParameter method on
playdate.sound.synth says that parameters are indexed starting at 1, which would be the normal way of doing things in Lua.
setParameter, it appears that a two parameter synth like
kWavePOVosim will correctly have its parameters mapped to indices 1 and 2. If you pass 0, it appears to behave as though you passed 1. However with
setParameterMod, the parameters will be 0 indexed, and modulating at an index of 2 will have no effect.