I have been using a godin xtsa with rmc pickup and is synth-ready with a roland 13 pin out.
I love it. years ago (mid eighties) I had an midi rig and I stopped using it because tracking was so bad.
But with this one I have never overrun it. It is very sensitive and sometimes you may get accidental (false) notes.
I have it setup so I go from the guitar to a GR-33 with the 13 pin cable then the GR as a guitar out (dry guitar) and stereo synth output. I route the guitar out to guitar input on a digitech GNX4 and then put the stereo out of the GR to R/L line input on the GNX4. Then stereo out from from GNX to a mixer and my amps (wish I had a PA...)
This setup lets me do live looping of the synth or guitar. I really enjoy this setup and find that hearing myself and coming back to play leads over chords and/or bass lines has made me a better player.
I do find though that allthough there is an infinite number of tones / patches available through this setup I tend to stay with a smaller selection of ones I really like. (standup bass, breathy sax, wichita pipes, grand piano, horns, strings...)
I admit there are alot of patches that I dont like or get tired of but there are some are way cool.
for both the GR-33 and GNX4 there are many patches available on the net
I have read from some of the forums below that the built in RMC/piezo track much better the the gk3s and you dont have to worry about if you put it in the right place its aready there...
here are some other forums or resources
http://www.ludgerhesse.com/guitar-synth ... synth.html