Modifying sound files / ISO not loading

[hydef]

I wanted to replicate this mod for Virtua Racing FlatOut https://forum.xentax.com/viewtopic.php?t=16470 but any attempts to change the game files results in the ISO not loading any more. I'm simply saving as ISO with PowerISO after I'm done. Any ideas what I can do or why my game no longer loads after I change a file within?

I've tried 2 methods to edit the sound, the one described there - hex editing the .hd file and also using Awave Studio to reduce the volume of the particular sound banks to 0 and repacking with ps2-bankmod.

[goody_fyre11]

PowerISO isn't capable of saving PS2 ISO's and having them still be functional. UltraISO works for most people but it costs money. ImgBurn works for a few people and is free.

[hydef]

UltraISO loaded it no problem, thank you. That was easy.

I must have done something wrong with the editing, though because the console repeats things like this on a black screen just before a race

SeSq_BdHdOpen : cdrom0:¥VRUS¥SOUND¥SE00 LOOP GO !!
Se_BdHdOpen : cdrom0:¥VRUS¥SOUND¥SE00.BD;1
BD_ADDR = 53264
Se_BdHdOpen : cdrom0:¥VRUS¥SOUND¥SE00.HD;1
HDADDR : 1897872
SeSq_BdHdOpen : LOOP END !!