According to MobyGames, it seems Toshinden music had been reworked at least once between the different platforms releases.

I knew the PlayStation version (first 3D combat game i played and one of the first PS games, along with Ridge Racer), and its great soundtrack.

But the PC version got a quite "draft" version of the soundtrack in comparison.

Check the extreme vibrato on Eiji's theme!
https://www.youtube.com/watch?v=mJHZj0npu1k
Maybe the result of a device or software interpreting midi commands not like what the composer intended.