Hello David, > After much experimentation with settings, I have now got the sound from > Qtractor back to the headphones. The distortion is still there. I > would be tempted to think it might be a fault with my Raspberry Pi, but > the sound is fine when using 'aplay', so clearly the sound system on > the Pi is fundamentally OK. > > Comparing the settings in QJackCtl in the Parameters and Advanced tabs, > they are the essentially the same both on the Pi and on my HP laptop > running Ubuntu 18.04. > > I'm stumped. You might want to check out https://wiki.linuxaudio.org/wiki/raspberrypi#on-board_audio The onboard audio is still PWM and < 16-bit as far as I know so maybe that's the cause of the distortion. Best, Jeremy
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