mixer
Display/set sound levels. tldr-pages
On DOS
DOS
Display current volumes
MIXERSet master volume (left:right percentages)
MIXER master 80:80Set Sound Blaster volume in decibels
MIXER sb d10:d10Set GUS left channel only
MIXER gus 50Set volumes without displaying result
MIXER gus 40:40 /NOSHOWList available MIDI devices (Windows only)
MIXER /LISTMIDI