The options are stereo, left and right. Similar to oscillator sample settings, if you tamper with these, it starts to show "custom". Used some of the generic features of go1.18, so had to update go.mod to require go1.18.
The "auto" was misleading, as it meant self modulation when targetting a unit within instrument itself and just voice 0 when cross-instrument modulation. This feature changes the "auto" meaning "self" for instruments self-modulating, and "all" voices for cross-instrument modulations. "all" is implemented by compiling a single send into multiple repeated sends, with only the last popping the stack (if necessary).
Closes#107
BREAKING CHANGE: The problem with crush was that it had very few usable values. This changes the crush to map the value nonlinearly, so the crush resolution is bits. Still the upper portion of the values is not very usable (bits 12-24 i.e. hardly any crushing), but at least the lower portion is usable. But now crush resolution has slightly different meaning.
