1. The neck was widened slightly (1/32") at the body end. This was to correct problems for players who were having trouble with the high E string slipping off the neck on the 12th fret and up.
2. The switch was moved near the volume knob. This was done to help prevent accidental hitting of the switch, especially while strumming.
3. The "tone" knob was replaced by a volume knob (NOTE: it was always a volume pot - the "tone" knob was a sort of joke).
4. We added a comfort contour (a belly cut) to the top and back of the body.