subsystem <SS> 0|1
Subsystem <SS> is either on (1) or off (0), where <SS> is a numeric value indicating:

subsystemnumeric value
VIDEO1
AUDIO2
MOVE4
TELEPORT8
RAPID16
VOICE32
MIND64
PREAMP128
POWER_AMP256
RADIO_IN512
RADIO_OUT1024
GPS2048
IDENTIFY4096

These values were changed in Companion 8.4 to be more consistent. See practical breakdown here.