So I did everything like you said, I got my MIDI Breakout cable from M-Audio and hooked it up to the RCA cable which goes into the Virus' SPDIF jacks.
However, something's wrong: there's no sound when I switch the Virus' patch in the Common tab to Out1 L+R (see below). Nothing is playing.
1) MIDI end successfully connected to my M-Audio soundcard:
[Blockierte Grafik: http://i48.tinypic.com/dxz3wl.jpg]
2) The RCA's I/O go into the RCA cable. Red=O, White=I. (Yellow is not used)
[Blockierte Grafik: http://i45.tinypic.com/2qxtksy.jpg]
3) The RCA connects to the Virus' SPDIF I/O:
[Blockierte Grafik: http://i47.tinypic.com/1564wep.jpg]
4) On the Virus plugin screen, for Patch # 1, changed from USB to Out1 L+R:
[Blockierte Grafik: http://i49.tinypic.com/2lk37dw.jpg]
No sound.
I also tried going into my project preferences changing FL's settings to use "S/PDIF M-Audio Delta Audiophile" as my global Input/Output, still no sound.
EDIT: I also tried hooking up the Virus S/PDIF-O to Breakout RCA-I, just one-half of the double RCA cable used (White). There is just one cable, White, and it goes from S/PDIF-O on the Virus into the S/PDIF-I on the breakout cable. But that didn't work either, still no sound on Out1 L+R. (The red half is unused.)