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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, Spotify, etc); very inconvenient. Workaround 1 unloads every sound card and then reloads them all...

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 Name: alsa_card.usb-Teensyduino_Teensy_MIDI_Audio_6705240-02 Driver: module-alsa-card.c Owner Module: 28 Properties...

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 teensy:avr:teensy40:usb=serialmidiaudio . did the trick! In addition, I'm running into some issues now...

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 USB. I expected this to be relatively simple, but after some troubleshooting and getting the USB...