That's great news. Thanks for the use of your time and your help. 
Posts by evilcraftknife
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I was just looking at that model. Very reasonably priced too.
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Oddly I have an x86 based notebook, when I hook the device up to that I get the same output from alsamixer but can still control the audio from the desktop.
Thanks for the help but I think I'll give up with the Mbox2. Can you recommend an external audio device for LibreElec? Is there a HCL?
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Hi, thanks for the reply
I just checked. When the Mbox2 is under RPI OS I get sound output but is only configurable by the controls on the box itself. The desktop volume control is greyed out.
alsamixer states "This sound device does not have any controls"
I get the same under LibreElec but without any sound. I find audio on Linux to be a bit of a black art. How do I find which audio driver is in use?
LibreELEC:~ # aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi0 [vc4-hdmi-0], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: vc4hdmi1 [vc4-hdmi-1], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 2: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 8/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 4: M2 [Mbox 2], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
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Hi
After installing LibreElec 10 my Mbox2 audio device wasn't listed in the available audio output devices. So I edited /etc/modprobe.d/alsa-base.conf and modified
options snd-usb-audio index=0
to
options snd-usb-audio index=4
The device is now listed but sound only outputs via HDMI. The device works flawlessly on my other Raspberry Pi 4 with no configuration necessary.
Has anyone got any advice?
Thanks in advance
Kev