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I have 3 Behringer UCA-202 DACs going into a mixer. I want something similar to this setup:

  1. 1 DAC: Misc Audio to be mixed: output to go to the mixer.
  2. 1 DAC: Audio In: Record/Broadcast: input to come from the mixer.
  3. 1 DAC: Input to come from AUX send 1 on the mixer, and Output to go to the mixer on another channel. This will be used for Skype.

I have one laptop, I want it to handle all of this. I can get all of this working properly however it takes way to much time for my liking. Is there anyway I can ease this process. All of these DAC's have the same USB ID, 08bb:2902. They're all plugged into the same USB hub though (which I keep on my desk). Further, I'll plug that USB hub into the same input on my computer. This yields static device.bus_paths in Pulse,

"pci-0000:00:1d.7-usb-0:2.1:1.0" "pci-0000:00:1d.7-usb-0:2.2:1.0" "pci-0000:00:1d.7-usb-0:2.3:1.0"

Can I always associate a sink with a specific bus_path? Every time I plug or unplug the USB hub I get new sink addresses?

This would permit me to script the rest of what I need to do with easy PULSE_SINK=, commands.

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Your sinks will all have a property you can use to figure this out -- device.bus_path and sysfs.path. You can examine these with pactl list sinks.

In the ideal world, your USB devices will all have unique serial numbers which you can see in the device.serial property, which would allow you to identify the device regardless of the port it's plugged in to. Unfortunately, most device manufacturers don't bother with setting this to a unique value per unit.

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  • Right, but is there a way to get a preset SINK, or must I figure out the sink on the basis of device.bus_path each time? Commented Nov 23, 2012 at 16:37
  • I'm finding that in PulseAudio 3.0 the bus_path and sysfs.path change. =/ Commented Jun 15, 2013 at 18:47

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