How to enable dummy mixer in GUI?

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1

I want to use the dummy mixer in Volumio. I have the snd-dummy module auto-loading at boot by adding that module to /etc/modules. It is loaded:

root@volumio:~# aplay -L | grep -i dummy
default:CARD=Dummy
    Dummy, Dummy PCM
sysdefault:CARD=Dummy
    Dummy, Dummy PCM
dmix:CARD=Dummy,DEV=0
    Dummy, Dummy PCM
dsnoop:CARD=Dummy,DEV=0
    Dummy, Dummy PCM
hw:CARD=Dummy,DEV=0
    Dummy, Dummy PCM
plughw:CARD=Dummy,DEV=0
    Dummy, Dummy PCM

However, when I go to Settings -> Playback Options, under Volume Options, “PCM” is the only available option for “Mixer Control Name”. I’d like to change that to “dummy”.

I can edit the /etc/mpd.conf file directly, but that causes the GUI to behave strangely… Just wondering about the “proper” way to do this.

This is Volumio 2.201 on Raspberry Pi 2.

Thanks!