Here is a profile of the VG-99 GR-300 synth done by tapping into the 13 pin pickup.
Play single notes with the bridge pick up.
Think Pat Metheny or King Crimson.
Different sounds can be had with different pickups.
It sounds best with gain below 50%.
Its up on the rig exchange now.
Bill
[Blocked Image: http://www.led-zeppelin.org/joomla/images/stories/gear/roland_gr300_01.jpg]