User blog comment:RottenBlock/Toushin Toshi 1 Patch 1.5/@comment-80.144.159.180-20200411101948/@comment-80.144.159.180-20200413222008

Hm, even with the grinding and then entering floor 2, fighting a bit, before acquiring the crest? Might test more tomorrow and even try it in the original, Japanese version. As for MIDI drivers or a program, I doubt it. All I have is the K-Lite Mega Codec pack. Regarding MIDI...should it even work though? After all, the System39.ini file says:

UseMIDI        = false UseCD        = true UseWave        = false UseDSound    = true UseDSound3D    = false
 * 音楽使用デバイス

So maybe the game tries to use MIDI but because it's "false", the error happens? If it was 100% reproducable, one could try setting it to true and see whether the error still happens.