I'm a new owner of an A6 and I encouter a problem with PWM waveforms. Wether I use VCO 1 or 2, there is a backing distorded noise generated with the waveform that I can easily ear above C3 on all programs that use PWM. I did the autotune trick several times and everything shows OK. So what's wrong with the PWM waveforms ? Do you get the same thing than I ?