Sorry for the long delay in response. Got a baby which greatly limits my online time right now.
Thanks didn't know that about ALSA. I setup Mangler with PulseAudio. Still having trouble getting game sound and vent. When I start WoW game sound works, but still no vent. WoW sound settings are set to system default with sound channels set to high. When I change the sound channels to medium or low, it kills game sound and I can hear vent (actually seems to plays back any vent sound from when game started). Restarting game always resets the sound channels to high. So, maybe if I figure out how to keep the sound channels at medium or low, after restart both will work?
Also tried setting Sound_NumChannels "32" in Config.wtf, but starting game resets it to 64.