In the latest just released version of VLC for mac/win Version 2.1.2 They fixed audio issues &most importantly they FIXED
the following audio issue:
* Fix stuttering or silent playback when using sound enhancers or external
audio devices on OS X
see the following url for more info on fixes:
http://www.videolan.org/developers/vlc-branch/NEWS
the section to look at / pay attention to is:
changes between 2.1.1 & 2.1.2