Custom USB soundcard configuration

Hi there,

I’m relatively new with this project, and I’m still trying to bring all components I have at home: RPI4, Behringer usb soundcard, keyboard midi controller and bluetooth speaker.

First I tried the Behringer soundcard with the available webconf configutation and it woks fine!

Now I want to connect the bluetooth speaker, but connecting it through the USB.
aplay -l gives me the key AUDIO to introduce in the webconf. So my configuration results in:

Soundcard: Custom Device
Config: Empty
Jackd Options: -P 70 -t 2000 -s -d alsa -d hw:AUDIO -r 44100 -p 256 -n 2 -X raw
Aubionotes Options: -O complex -t 0.5 -s -88 -p yinfft -l 0.5
Limit USB speed to 12Mb/s: NONE
Mixer Controls: PCM

This configuration partially works, because if I launch the audio test from Zynthian-UI->Admin-Test Audio I can listen it, but I can’t control the audio output volume.

To control the volume audio output I tried both, 1) thought webconf Advance View->Mixer Controls->+ and 2) alsamixer -c 3 in the terminal. If I move sliders through webconf, I see how it changes in alsamixer, but volume is not changed.

I’ve tested the speaker on my Ubuntu distro, and I can modify the volume with alsamixer.

I assume it’s a configuration issue, but I’m lost. Any idea of how I could proceed to adjust the volume?

Thanks!