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RetroPie: Disable Builtin Sound Card and Enable USB Audio Only

Edit the file /boot/config.txt and comment the line:

#dtparam=audio=on

Now edit the fileĀ /etc/modprobe.d/alsa-blacklist.conf and add:

blacklist snd_bcm2835

Finally edit the fileĀ /lib/modprobe.d/aliases.conf and comment the line:

#options snd-usb-audio index=-2

Or if you just want the USB Audio to be your primary sound device.

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