(Settings for onboard soundchip. Addin soundcards usually provide their own control-panel app)
configure vent to run multiple instances, one for music and one for regular talking.
rt-clik on the vent desktop icon / properties / add a -m to the end of the ‘Target’ line.
(ex: “C:\Program Files\Ventrilo\Ventrilo.exe” -m) the space before the -m is required
configure the music instance with a different login name so you can tell them apart when connected.
(note: if you ever need to make configuration changes, exit all copies, startup one, make the changes, then exit and restart all copies of vent)
goto Windows-control-panel / sound / Recording tab / rt-click in window / check ‘show disabled devices’ / rt-click on ‘Stereo Mix’ and select ‘properties’ / Levels tab / set volume level (50%) / Advanced tab / select ‘2 channel 44 Hz’ in pulldown window’ / click OK
select Playback tab / rt-click on ‘Speakers’ and select ‘properties’ / Levels tab / mute the microphone and any other jacks that are not in use (click on the little speaker icon next to each one)
reboot to make sure settings are in effect
in vent setup/voice tab, set both input/output devices to the device name of the soundcard (ex: Realtek…) and check the ‘Use Directsound’ boxes
in the hardware mixer section, set Mixer=Stereo Mix, mux=Master Volume, and line=Master Volume
(use the ‘line volume’ slider to adjust the microphone output volume)
set sensitivity=1 or 0 and uncheck PTT (setting sensitivity=1 will stop broadcasting during times of no outgoing signal, like in-between songs or if you pause/stop the music. It will also help flush the buffers)
In vent setup/events tab, set all events to “Nothing”
on the main screen, check the ‘mute sound’ box at the bottom
note: if you don’t want to listen to the music coming back thru vent then on your talking client select the music client > rt-click > user > mute
taken from: http://forum.ventrilo.com/showthread.php?t=34421