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To enable DTS pass-through for your M-Audio device under Windows Vista (32 bit), click the Vista (Start) button and select Control Panel. Double click the Sound control panel icon to open it.
On the Playback tab, locate the S/PDIF digital output listing for your M-Audio device:
Double-click this listing, or click it once to select it and click the "Properties" button. On the Supported Formats tab, place a check mark in the box for DTS Audio and click OK.