Probably rom related, this module only sets a single prop. So, if there's some prob, I probably can't do anything ?V4A is working for me with this mod enabled alongside it.
However the mod itself doesn't work on my HTC U11 anymore. I used to get 30 steps with USB C to 3.5mm adapter and 15 volume steps repeated twice using direct USB C headphones. Now both have 15 volume steps doubled. Hmmmm