I don't think there's ever absolute eerie silence in PSX (like 7:54 on the video above).
Either there is music or constant cheering/ambient sounds on all stages.
i don't know if this is the hack fault or the Saturn version fault.
The game grew 150 MB from 0.91 to 0.92, i'm not sure if this is the patcher doing and why it's doing it. But here i thought it worth mentioning cos it seemed unnatural.
0.91 -> 0.92
cd1 524 MB -> 602 MB (+78 MB)
cd2 495 MB -> 569 MB (+74 MB)
Total increase: 152 MB