Board revisions previous to revision F: 

1) Loop an 1/8" stereo cable from the Line Out to the Line In. 
2) In the mixer, select Line In as a record source. 
3) Mute all other sliders except Main, Input Monitor, and Main Synth. 
   (This will result in the best signal.)
4) Play the MIDI tracks you wish to record and set the levels. 
5) You can now record the Kurzweil Main Synth as an audio track.

Note: These same steps allow recording the output of any MIDI 
      daughtercard attached to the Pinnacle, as audio.

Board revision F (included with Project Studio): 

1) Record the Main Synth directly by selecting Digital Synth as a 
   record source in the mixer. 
2) You will now be able to record the synth using any audio recording 
   software.