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Note that on Windows Vista and later these controls actually operate on the Master Volume, and both Left and Right will always track each other. On Windows XP and Win9x, the controls track by default, unless the 'Vol' button between them is depressed to unlock tracking.
SynthVolL=0 sets the Left volume to maximum (0 step). SynthVolL=10 sets it to step -10, as does SynthVolL=-10... the minus sign is ignored here.
SynthVolL=>1 increments the current step up toward 0. SynthVolL=>-1 decrements the current step toward more-negative (softer) values.
SynthVolR controls the Right volume in the same way.
Right can only be controlled separately from Left in Windows XP and earlier, by toggling the 'Vol' button on or using SynthVolUnlk=1 to unlock the default tracking behavior. SynthVolUnlk=0 restores tracking, and SynthVolUnlk=x toggles the current state.
GVL=n sets the Left volume to step n. The sign of n is ignored; all volume steps are negative (or zero).
GVR=n sets the Right volume in the same manner.
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