- Open the Master Volume panel by double clicking the volume icon in the System Tray
- Observe that this panel contains a Wave option
- Observe that when varied, Wave influences sound volume exactly as if it were a volume control in its own right
This is handy because I can use it when necessary to set the volume to a very low level (lower than 1 bar alone on the volume slider allows) but I wondered if my guess is correct as to what it is; I assume that sound being a longitudinal wave, the wave slider is controlling the amplitude of the wave whereas the volume slider controls the amount of amplification (gain) given to the resultant output signal. Correct, or wide of the mark?