hi i have a test patchbloch,but after install and start system it don’t recognized my usb audio card berhinger uca 200. Other problems with jack server for start and other problem with pure data don’t start… For the moment i return on my raspbian stretch for totally used with all programs audio production.
You have to find the right settings in Jack for your audio card.
If your audio card was not found at all by the system, take a look at dmesg log. Also you may try installing a non-realtime kernel, by doing
sudo rpi-update and restarting the system.
Also check out the ‘USB audio’ section here: https://wiki.linuxaudio.org/wiki/raspberrypi#usb_audio
You have to run this command line to change the RT Kernel to the normal Raspberry kernel.
sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernel