If the VU meter in Mixxx shows samples and the ducking also works, It is likely an issue with Mixxx itself.
A restart of Mixxx alone should solve the problem. Can you confirm this?
Is there something suspicious in the mixxx.log file, after the issue has happen? By luck there is a log file with a number prefix from failing run. https://github.com/mixxxdj/mixxx/wiki/Finding-the-mixxx.log-file
What is your monitor mode setting?
If the VU meter in Mixxx shows samples and the ducking also works, It is likely an issue with Mixxx itself.
A restart of Mixxx alone should solve the problem. Can you confirm this?
Is there something suspicious in the mixxx.log file, after the issue has happen? By luck there is a log file with a number prefix from failing run. /github. com/mixxxdj/ mixxx/wiki/ Finding- the-mixxx. log-file
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What is your monitor mode setting?