http://bugs.winehq.org/show_bug.cgi?id=28790
--- Comment #5 from hash HASH.DuOrden@gmail.com 2012-02-08 06:35:39 CST --- I've tested TeamSpeak 3 client for windows version 3.0.3 (20.01.2012 14:49:07) and it suffers from same problem but with some qualification: When first time executed "ts3client_win32.exe" uses for input and output default sound devices named "Default" and there is no sound from loop-back test for Capture but in same Capture test the volume meter shows that ts3 is actually captures your voice but it seems can't play it back. If switch from "Default" "Playback Device" in "Playback" section of settings to real device, in my case it named "SB Audigy main", the Capture test is runes flawlessly. One a side note if as "Playback Device" in "Playback" section of settings used "SB Audigy main (vmix)", the Capture test is failed same as for "Default" "Playback Device". Another thing that should be noted is that with "Playback Device" in "Playback" section of settings set to "SB Audigy main (vmix)" or "Default" the Capture test fails, sounds of the program it self is played perfectly fine.
As a conclusion, there is some kind of problem with playback of sounds at the same time with capturing input from input like microphone if used with OSS4 VMixes.