SW Synth in the Sound Options

All right, most of you probably know the SW Synth in the volume options.

Anyway, I'm not sure if anyone here knows or is familiar with the Santa on Spaceship screensaver, but its music is MIDI, which requires the SW Synth to be turned up.

Well, for some reason, it will sometimes automatically turn itself all the way down, and I'm not sure why it does that.

Thanks in advance for any help.