Paul D. DeRocco wrote:
> I've got a Raspberry Pi with a HiFiBerry DAC on it, and a USB to MIDI
> converter plugged into it. It's running a GUI-less embedded Linux created
> with Yocto, which uses systemd and udev. The card numbers assigned to
> these two devices is unpredictable. What can I do to fix the card numbers?

You could use the vid/pid options of the driver.  See
<http://alsa.opensrc.org/MultipleUSBAudioDevices> or
<https://help.ubuntu.com/community/UbuntuStudio/UsbAudioDevices>.


Regards,
Clemens

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