Here's how to assign the Song playback audio (sound) to one of the Direct Outputs:
1. Press SETUP.
2. Press F1(OUTPUT).
3. Press the PAGE down button to select "Page 2."
4. Cursor to highlight "SONG."
5. Turn the value dial to select the output destination for the song playback. (Directs 1-8, Master L or R).
6. Press EXIT (or KIT) when you're finished. The new setting is saved automatically.