Thank you for this report. Does it use more % when you use the normal exe (not SSE, not SSE2)? You have a very fast processor so the encoding latency must be very low since it encodes fast. How much is the latency noticeable? I don't know. In the mixer, you can only choose one spdif ouput destination. It's probably a limitation of the drivers or of the sound card. From your tests, were you able to make an spdif ouput other than spdif0 work (alone, not two at the same time)?