I don't have an actual Apple IIgs myself, but I know that the normal audio output from an Apple IIgs is mono; a stereo expansion card is required for stereo output. Looking at the game's internal sound files, which are basically MIDI files, there are Program Change and Volume Controller events, but no Panpot Controller events. This indicates to me that the panning is probably an artifact of the MIDI player library that Sierra used --- possibly assigning pan positions by MIDI channel number, or having a fixed pan position for every instrument --- and that mono output is what was intended. If you agree, then I will reupload the pack modified in the manner that you described.
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