Hi Michael
Did your problem resolve?
I’m using Many Cam (free version) with Motu soundcard.
I’ve noticed that it works (recognizes my microphone) only on sample rate setting of 44.1.
Maybe setting the sample rate to 44.1 will solve your issue.
Or if you have managed to use manycam with sample rate of 48k please let me know how, as I have trouble with this too.
Arash