In BrawlBox, highlight the "ARC" at the top. It'll say "compression."
Brawl uses LZ77 compression or something for its PCS files, so make sure it's disabled for PAC files since they're uncompressed.
When i checked for the Compression it said None. So im guessing it's already uncompressed
I tried it in Brawl and it still froze after loading a stage. (No buzzing sounds im using Riivolution+Beyond's Settings) The blue light turns off and i guess it didn't work and just stays there.