I have volumio on a RPi3, with Hifiberry Digi+ and a digital amplifier. The Digi+ has no volume controls (hardware or software, as far as I can tell), and the amplifier has only a volume knob, but no left/right balance.
Is it possible to control the balance on the software level? I’ve tried installing the ALSA equalizer plugin, which could be somewhat abused for balance, but I can’t get it to work with mpd (see other topic). Could I maybe add another ALSA control only for balance (and I guess I’d have the same problem with mpd)?