I connected a Rode Podcaster through USB to my iMac (late 2015, Catalina). When recording voice-over I see the input bar move with the level of the mic-audio but there is nothing in the recorded files.
My iMac is connected to a Denon amplifier (optical cable) but I can't get any sound from the mic to the amplifier. Also after disconnecting the optical cable there is no sound from the mic on the iMac. Monitoring is 'on'.