Similar to changesysvolume, but instead of changing the whole sound volume,
changesysvolume2 changes the left channel and the right channel separately.
Examples:
changesysvolume2 1000 -1000
changesysvolume2 -3000 0
changesysvolume2 0 -5000 waveout
changesysvolume2 -3000 0 master 1