Use Loopback as Audio output


i want to do some FFT on the "real-time" audio stream. As far as I'm understanding the whole topic I have to use a loopback device to grab the audio stream with python. Can anyone give me some guidance how to make hifiberry-os use the Loopback interface instead of the DAC2 Pro I'm using?

I'd really appreciate some pointers in the right direction since I don't get anywhere with googling and config file scavenger hunts ;)

Setup: HifiberryOS on Rpi4 w/ DAC2 Pro

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