Portal 2
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How to remove voice-lines/dialogue from Portal 2
Από meow
this keeps turret voices, and other SFX such as ambient, portal gun, footsteps, etc... but makes every other annoying insufferable voice line mute. only way to play this game in 2024.
   
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just type this into console (enable it on Options > Keyboard and Mouse > Allow Developer console, open it by pressing tilde/key left to 1)

snd_setmixer potatosVO vol 0; snd_setmixer gladosVO vol 0; snd_setmixer announcerVO vol 0; snd_setmixer wheatleyVO vol 0; snd_setmixer caveVO vol 0; snd_setmixer coreVO vol 0; snd_disable_mixer_duck 1

change 0 to a number between 0 and 1 if you just want to lower their volume.

if you want to make this persistent just add it to your autoexec.cfg (Portal/portal/cfg/autoexec.cfg)

Source: https://github.com/p2sr/srconfigs/blob/0a95c03c98c33f85d47eb1e1ff1f3218bdaf8930/aliases.cfg#L4-L8