You need hardware that supports Multichannel PCM audio through HDMI to receiver. Second possibility is SPDIF with Dolby Digital Live or DTS Connect that can encode multichannel to AC3 or DTS (but you will loose quality due to lossy compression). Third possibility is analog multichannel outputI would like to second the request for multi-channel flac files. During playout I only get stereo but I am able to play DTS wav files correctly. If you need any more 5 channel flac files let me know. Also mikeyko if you could explain how I could use foobar to play them properly for the time being I would appreciate it.
I am using ASIO4ALL with ATI 4670 GPU. Next, you need foobar2000 and foobar ASIO plugin.