On the Raspberry Pi2 and Pi3, the Retrovol mixer crashes. It does work, but also displays a bogus volume slider, which, when clicked upon crashes Retrovol.
So, for the ARM boards, I am now using pnmixer, a volume control for the tray, and aumix, a mixer.
I have pre-configured pnmixer to launch aumix.
Both of these are in the Ubuntu repository, however I compiled a slightly older pnmixer, before it was ported from GTK2 to GTK3.
Preliminary testing on the Pi2, looks good.
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