Hello folks, sorry I am newcomer in pulse audio world and my post is motivated by a simple problem. Simple for you , tricky for me... On a Ubuntu 9.04 server running pulse audio without any sound card I run 2 Windows XP virtual box . Sound is Ok and on both of them , I am playing on the current virtual sound card (mapped on each vbox instance) and stream directly using virtual card as input on each . but.... On both stream sound is mixed , I heard the 2 sounds mixed out on each one !!! using pulseaudio management I saw : one sink "auto null", 2 output : #0 : virtual A on pcm_out #1 : virtual B on pcm_out 4 sources : #0 : peak detector #2 : A on pcm_in #3 : peak detector #5 : B on pcm_in #3 : peak detector Other point , here is my daemon.conf file, I saw a resample method : resample-method = src-linear disable-remixing = yes disable-lfe-remixing = yes Maybe it's wrong ... What I want is simple is that virtual A is ONLY play on #0 and virtual B on #1 . Thank for any help ....