I imported the French version of the GOUT soundtrack into Audacity along with the English version, and the waveforms are very different, even for the supposedly identical music. So I don't think that will work either. I also tried copying the english sound and used a compressor to bring down the vocals. Then I inverted the compressed soundwave, hoping to keep the higher volume voice while cancelling out the lower volume music, and while that may work with enough effort, it didn't sound good. There are also parts where the music is louder than the voice, rendering the method useless in those places. So I'm at a loss.