[B]

nvm the god bison intervened here's how to fix it for anyone else wondering it :

[21:20]
Brawl Bashin’ Bison:
sv_voicecodec steam
sv_use_steam_voice 1
or
sv_voicecodec voice_speex
sv_use_steam_voice 0

[21:21]
Banned for video game addiction:
k i can hear voices in the 2017 demo's
ill try for the 2016 demos, i remember it was an issue back then

[21:22]
Brawl Bashin’ Bison:
or (new ones)
sv_voicecodec voice_celt
sv_use_steam_voice 0
first is middle ones, second is old ones, last is new ones