Currently 'mute' is only implemented if your Squeezeslave/SB Player is routed through a controlled amplifier eg Denon or similar. The Vol up/down issue in #21 is almost certainly because media_config has an incorrect value for AudioDev in the line that is for that room. Look for a typo or incorrect value in AudioDev.
All the best
Andrew
Thanks Andrew,
but there are definitely no typos in it and the room number and device number are defintelly right.
So room is 4
The squeezebox is device 210
there are NO other device in the room
Room=4; AudioDev=210; VideoDev=; KeepScreenOnForOSD=no
should be all, right?