turnoff2 — Turn off instance(s) of other instruments at performance time.
kinsno -- instrument to be turned off (can be fractional) if zero or negative, no instrument is turned off
kmode -- sum of the following values:
0, 1, or 2: turn off all instances (0), oldest only (1), or newest only (2)
4: only turn off notes with exactly matching (fractional) instrument number, rather than ignoring fractional part
8: only turn off notes with indefinite duration (p3 < 0 or MIDI)
krelease -- if non-zero, the turned off instances are allowed to release, otherwise are deactivated immediately (possibly resulting in clicks)