I have heard of similar issues and iirc it may relate to mismatched samplerates ie. your hardware is running at a different rate from the software stack. Possibly nothing to do with your motherboard but more a config issue.
Which sound server are you using, PulseAudio, JACK, or ALSA? Which version of Debian and which desktop environment?
Post the output of this command:
You can check card and PulseAudio rates with:
Code: Select all
cat /proc/asound/card0/pcm0p/sub0/hw_params
pacmd list-sinks | grep -e 'name:\|Hz'
There are a number of issues that may affect sound and external sound cards. I suggest you search at LinuxMusicians forum where there is much more expertise in using semi-pro sound cards. If no solution is found it may be advantageous to register and ask your questions there.
Note I have split this topic from an unrelated one in which it was originally posted.