Capcom games' .MUS file format
Hi, i am an audio engineer by trade so i think that i have the answer to your question, well at leats part of it.
the flange effect that you are hearing is due to a phase variation in the waveform. This phase variation is used to create the spatial effects that you here within the game using Q-Sound.
Q-Sound works in a similar way to the original Dolby Decoder box that used to be used for cinema sound in the early 90's.
The original dolby sorround was a crude for of what we know now as 5.1 sorround sound. To send stuff to the rear speakers in the original dolby format, you had to phase audio information. (which was a real pain in the ass) This is simialr to the way that Q-Sound Works, except in stereo.
Q-Sound is actually more similar to what is called a brainwave convultion, that is using phase variance, you can simulate a sorround effect using only 2 speakers.
Unfortuneatly, the only way to decode this information is using proprietry software/hardware. But you could try opening the file in protools free to seperate this file into Stereo info only and mono info only. This is done using a matrix master a
from here you should be able to illiminate this effect.
Firstly, import your stereo file into protools. Split it into two mono files on seperate tracks. Send the left channel out of bus 1 and the right channel out of bus 2. Create 6 new auxillary inputs. Make the input to the first two auxillary inputs bus 1 and bus 2 respectively, then pan both hard left. On auxiallry chaneel two, place a one band eq and inverse the phase.
Next make the inputs on aux channels 3 + 4 bus's 1 and 2 respectively, this time pan both hard right. Now, on aux channel3 place a one band eq and inverse the phase. Now you should only have stereo information coming out of these channels.
To seperate the mono information on aux channels 5+6 make the inputs bus 1+2 respectively and pan both to the centre. now you have only your mono information!!! you should be able to eliminate the phase now.
Oh yeah, your file is playing back too fast because you have the wrong sample rate.
msg me any questions!