Well, they've worked out the tracking, the problem is, or was about 10 years ago, is that Roland had very limited editing options for the synth engine. In fact, I think they were effectively samplers, not proper synths. But I played one at Sam Ash Music once, no matter what I did, in terms of sloppy playing, things like pick slides, chiming the strings behind the nut, etc, the thing had no trouble tracking any of it.
Now, what I understand is, the MIDI out on these things is still perceptibly slow. So if you wanted to hook up to a good MIDI synth, you're still going to have the delay between when you strike the string and you actually hear the sound come out of your synth. I guess that isn't as bad as it used to be, but from what I gather, it's still there.
The best guitar synth setups, actually, I guess, are dedicated MIDI controllers that look and operate like guitars, but aren't guitars themselves. I mentioned the Touch synth from the early 80's and the Synthaxe, and there have been other ones, too.
I remember there was one in the late 80's that used some kind of light sensing thingamabobber, you strung the guitar with all high E strings (actually, I guess you could put whatever you wanted on it, in terms of strings, but like the Synthaxe, I gather most people who did use it used high E strings, just for the ease of play), and supposedly the tracking was top notch. I believe it was called the Photon, and I think it's what Carlos Alomar used for his Dream Generator album (where the majority of the synth parts were triggered from his MIDI guitar rig). I imagine that kind of thing has been developed further since then. The only thing is, like with the Synthaxe, it's not a conventional guitar, you can't flip a switch and suddenly get regular guitar sounds, unless you're using a sampler.
For my interests, synths are a hands on thing, ie it involves a lot of twiddling of knobs and flipping of switches and pushing of buttons. Hence, a guitar synth, to me, kinda limits what one can do in that regard. That's why I have a modular synth.
Still, there's a part of me that still wants a GR-300 and GR-700, with a Lake Placid Blue G-505 (or one of the other Strat-like guitars that came out in the mid 80's, with the Roland electronics in them...actually, come to think of it, I always coveted Steve Hackett's blue Schecter that he used with his guitar synths, it's the guitar he's playing in the When The Heart Rules The Mind video).
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