chnset — Writes data to the named software bus.
Write to a channel of the named software bus. Implies declaring the channel with imode=2 (see also chn_k, chn_a, and chn_S).
ival -- the control value to write at i-time.
kval -- the control value to write at performance time.
aval -- the audio signal to write at performance time.
Sval -- the string value to write at i-time.