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So it appears that PulseAudio will occasionally "forget"/reset the Teensy card config, necessitating running the above again. Very annoying.

Okay, two better workarounds have been established.

Again, restarting PulseAudio does work, the issue is that this also disconnects any playback sources, so they have to be restarted (browsers,...

Restarting the Teensy reverts back to Pulse thinking that it is only an input device.

This is what PulseAudio thinks the Teensy is prior to restarting PulseAudio. Restarting the Teensy does not change this.


Card #7
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Thanks so much Paul!

For posterity, my issue was stemming from using arduino-cli and not using the right
usb argument. Turns out I needed to be using
arduino-cli compile --export-binaries -b...

Hello all, thank you for considering my question.

I am trying to provide audio in to a Teensy 4.0, do some FFT to it, then send the output back over serial to the same host that is connected via...