I did a one line change to revision 3 and the left channel outputs to both
speakers and ignores sounds incoming to the right channel. Hence the same
problem as the original ucm2.
The Volume buttons works on the speakers.
diff ~/Downloads/HiFi.conf /usr/share/alsa/ucm2/Valve/Jupiter-1/HiFi.com
62c62
< cset "name='Left PCM Source' DSP"
---
> cset "name='Left PCM Source' 0"