width value of 0 makes a stereo sample play as if it were mono (adding both
channels and compensating for the resulting volume change). A value of 100 will
make the stereo sample play as original.
Any value in between will mix left and right channels with a part of the other, resulting in a narrower stereo field image.
Negative width values will reverse left and right channels.
width=100 // stereo width=0 // play this stereo sample as mono width=50 // mix 50% of one channel with the other