Hi list - hi Patrick, pix, aym3ric (and thanks for your considerations..!) after quite some tests I think I can conclude that Patrick is right. Portaudio does not work with uneven streams. 2 channels in, 2 channels out works fine with PD and emi 2/6 (or A26 as they call it now) under Win XP. (any ideas of how to change/replace portaudio...?). Whereas with Max (for windows) its possible to adress all 6 outputs. So the question is whether someone has an idea of how to get a PD audio stream into Max (realtime) - so that I can do the sound job in PD and use MAX as an output device. Cheers Achim