Biorand on GOG and RE: Enhance Mods

Hello. I am trying to use Biorand on GOG Resident Evil 1-3 Versions, with RE Enhance Mods. It mostly works, however, more often than not there is a problem with voice randomization, in RE2 player Leon model swaps, however often his voice not. Same thing with NPCs, Marvin models swaps, but his voice is almost always Marvin. Do you have idea where this problem is coming from? Could it be GOG version different files structure or something?