I've done that jb63, here's a bit more detail on what hi and low posted-
If doing it on playback from the R44, you'll get individual output level control over each of the 4 channels. If doing it 'live' while recording, the only control over individual channel levels is via the record input gains.
You won't have control over panning in any case- channels 1 and 3 are both routed to the Left channel output, channels 2 and 4 are both routed to the Right channel output.
As hi and low mentioned, the digital output duplicates the headphone output. The analog RCA outputs may be switched between 4 individual channel outputs or 2 pairs of stereo outputs which are duplicates of the headphone out (assuming any firmware version later than the original release).