Reference: sndMakeMultichannel
sndMakeMultichannel(snd1, ..., sndN) returns the N-channel sound obtained when using snd1 as the first channel, ..., and sndN as the Nth channel. snd1, ..., and sndN must all have the same sample rate.
sndMakeMultichannel(snd1, ..., sndN) returns the N-channel sound obtained when using snd1 as the first channel, ..., and sndN as the Nth channel. snd1, ..., and sndN must all have the same sample rate.