MacOS Audio player which allows to select the output soundcard/channel in a multi USB soundcard setup.
1. Mac Mini with 5 Mini USB Soundcards (means 10 output channels) attached
2. playback of multiple soundfiles via a terminal tool (instead of afplay which is not able to select a output channel)
Idea: afcplay -filename -channel-number -amount-of-loops (-1 infite looping)