Amp+ dB volume scale missing

I am using my new Amp+ with a RPi3 and am loving it.  Volume control works fine with alsamixer.  Normally however I am using shairport-sync, and unfortunately the hardware volume control does not work with it.  The reason is that, unlike the DAC+, the Amp+ does not expose a dB volume scale range.  The error is:

the hardware mixer specified -- "Master" -- does not have a dB volume scale, so it can't be used.

 More info at https://github.com/mikebrady/shairport-sync/issues/232

It would be very helpful to have all the Hifiberry products expose a dB range.  The ALSA call is: snd_mixer_selem_get_playback_dB_range.




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