extmodem decodes only when microphone playback isn't muted

[jpalczewski]

Hi again,

I have another question: In #11 there's specified my environment - I noticed that while Mic in Playback(I'm speaking about alsamixer) is muted, extmodem isn't able to decode either DTMF tones or APRS packets, so in case when RPi mic & speaker output are connected to speaker & mic in my PC, I can hear all sounds back, and I don't know how to solve it - I'm sure that problem is related to USB card at all(on soundblaster even soundmodem worked correctly), but there's maybe some solution - do you have any ideas? APRS is simplex at all, but I don't know how modules like DRA818V will behave.