Can I use KSPROPERTY_AUDIO_CHANNEL_CONFIG and use the ChannelMask to determine the number of channels in a source stream? If this will provide the information needed than how do I add a KSNODETYPE_DAC to my GFX filter for the sole purpose if getting this information? Thanks, Chris ------------------------------------------------------------------------ ------------ Christopher H. Perry Bose Advanced Development Engineer (508) 766-6230 Chris_Perry@xxxxxxxx