Arch Linux

jussijussi

Member

Registered: 2020-09-27

Posts: 5

USB sound card works in Alsa but not in Jack

I have an issue with Jack and USB sound cards. I mostly use the onboard sound, so I don't know exactly when this occurred.

The cards (M-Audio Ozone and Zoom H2) work fine in Audacity if I use Alsa, but not with Jack. Changing the interface in QjackCtl does nothing, sound is still played through onboard, and the cards don't appear in the graph. Only the MIDI connections of Ozone are shown, before there were also audio connections.

Any idea what could be wrong?

Thanks.

jussijussi

Member

Registered: 2020-09-27

Posts: 5

Re: USB sound card works in Alsa but not in Jack

I tried without running Jack at startup and was able to use the USBs after launching QJackCtl manually.

Maybe there's something wrong in the scripts?

My .xinitrc ends with

exec /home/xxxx/start_jack.sh &
exec startxfce4

and start_jack.sh is

#!/bin/bash

jack_control start
jack_control ds alsa
jack_control dps device hw:H2
jack_control dps rate 44100
jack_control dps nperiods 3
jack_control dps period 1024
sleep 10
a2j_control --ehw
a2j_control --start
sleep 10
qjackctl &

Jack starts fine, but always with onboard sound.

Last edited by jussijussi (2022-01-24 19:55:22)