Adjusts the background playback volume.
Percentage corresponding to which the Background Volume has to be increased
volume percentage is 100. In such circumstances, the wavefile will be played without any modification.
- Values below
the default volume will decrease the volume and values above the default will
increase the background sound. Suppose the command is BgVolume 50; the played back volume will be just half the original sound.
- BgVolume resets to 100% on every call.
//play welcome message
//accept user ID
$uid = input(5,4)