I use Audacity 3.7.0 with Ubuntu Studio 24.04.1 LTS (64 bit Linux).
All my audio apps are connected through PipeWire, jack and PulseAudio to an external analog audio mixer (Behringer Xenix 1204USB) via USB cable.
Of course, I can record the singer voice from the microphone to the mixer to the computer at the same time he/she is hearing the prerecorded instrumental track from the Audacity itself.
But, I wonder if I can get the singer doesn’t hear his/her voice FROM the computer track (which has some noticeable and annoying time delay).
Can I cancel the sound from the Audacity voice recording track to the mixer without cancel the instrumental track? How?
Of course, the singer will still hear his/her voice because the external mixer does this.
BTW, this “problem” started when Ubuntu Studio started to use PipeWire. Before that, I didn’t notice this audio time delay. And, apparently, this is a PipeWire “bug”, not solved yet.
But, I discovered it is not an Audacity issue. It is a PipeWire-Jack behaviour. These “units” automatically connect inputs and outputs according with the standard audio connections. In this case, the mixer output is connected to the PipeWire service input. But, this unit is connected directly to the main output, which is the mixer input, so… that connection makes the ugly echo. So… Manually I disconnect that connection and reconnected it directly from the mixer output to Audacity input. That’s the solution.
There should be some warning about this somewhere in Ubuntu Studio, but…
I don’t know how “standard” that is. That connection will almoat always create delay/echo feedback pathways. Or you can make that pathway avilable as a special setting. Not default.
I can make it worse. You can have two echoes. One from Audacity and one from PipeWire.
I think this is the marketing thing of trying so hard to “help you,” that it fails.
