volume 0.3
snd_musicvolume 0
windows_speaker_config 4
snd_legacy_surround 0
snd_pitchquality 0
snd_mixahead 0.05
snd_ducktovolume 0.55
snd_duckerattacktime 0.5
snd_duckerreleasetime 2.5
snd_duckerthreshold 0.15
snd_mix_async 1
snd_mute_losefocus 1
snd_surround_speakers 2
adsp_debug 0
dsp_slow_cpu 1
dsp_volume 1.0
dsp_enhance_stereo 0

don't forget voice_enable 1
... lol