I've just finished building the Pimoroni Picade which is recommended except its WAY too loud. I'm banned from playing it. Editing the rc.local file to run amixer cset numid=3 1 at boot up solved the no sound problem but adding amixer sset PCM,0 50% to reduce the volume has no effect.
However, if I try sudo amixer sset PCM,0 50% in the command line and then test a .wav file the volume is reduced. It appears PiPlay doesn't respect the volume setting and reverts to 100% volume every time it boots up.
This was discussed in a previous thread with the conclusion it's an Alsa problem but I'm not convinced.