I have no idea what you are talking about. but hope someone responds cause I'm curious to learn. What is a micro?
OHH! lol what mic are you using? you attached a usb mic to the vm? or is this one attached to your usb camera? you mean the camera is working but not the mic?
so I assume you already tried to attach audio input from the qubes-manager menu. What about in adobe connect is there any options to change mic settings? What about pavucontrol, or in dom0, to change default mic setting?
also alsamixer in dom0 to check the levels is not muted.