SDL Mixer changing system panning

Every time I play a MIDI file with Mix_PlayMusic, it changes the system SW
Synth (MIDI sequencer) output’s panning setting all the way to the left.
I’m running Windows XP Home and I’ve tested this with multiple MIDI files.
I haven’t set any settings that would affect music panning before executing
this command. Does anyone know what’s going on and how to stop it?

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