I can't fully answer your question, since I don't currently have a linux box set up for use with my QMX - but regarding the last part of your question on the I/Q mode:? The QMX gives (and uses internally) true I/Q data.? I have used it with two different Windows SDR apps, and the audio produced sounds great in SSB, Digital, and CW.? So there must be some issue with your particular setup if you are getting terrible audio.
Stan KC7XE
