With our multichannel sound cards, we have a summing node (KSNODETYPE_SUM) in the input topology so that multiple physical inputs can be summed into a single waveIn device. Under Vista, each input bridge pin creates its own waveIn device, so it would appear that summing multiple inputs to a single device is no longer possible. Is this in fact the case, or is there something I'm missing? Jeff Pages Innes Corporation Pty Ltd