Mute Groups 

ON 
MG1 90 50 7F 80 20 00
MG2 90 51 7F 80 20 00
MG3 90 52 7F 80 20 00
MG4 90 53 7F 80 20 00


OFF
MG1 90 50 3F 80 20 00
MG2 90 51 3F 80 20 00
MG3 90 52 3F 80 20 00
MG4 90 53 3F 80 20 00