Have you tried changing the following lines in Main.cfg (the one in your save game Cfg folder, not the SH3 Cfg folder):
[SOUND]
Music=Yes
VolumeGeneral=100 <- change to any value greater than 100
VolumeMusic=100 <- change to any value greater than 100
VolumeFx=100 <- change to any value greater than 100
VolumeSpeech=100 <- change to any value greater than 100
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