I am not much of a live performer and even less of an electric guitarist. But I've goofed around with digital signal processing boxes, and looping, and recording/sequencing, and have the following perspective on what would be bitchen. Some of these thoughts even come from my perspective of the Grateful Dead's performing approach, even though I wasn't a fanatical follower.
I'd like to be able to more easily bridge the gap between prepared materials and live performance, so that the master brain/computer thingey is actually "listening" to what I am doing and can correlate this with the library of prepared materials, and create some spontaneous live arrangements that are subject to some high level criteria such as tempo, meter, key, and density that I could specify one way or the other.
My take is that the solo performer using some form of either prepared or spontaneously generated (looped) backing cannot totally free themselves from the concerns of "which is preset #15?" or "which button do I press to trigger the TR-808?". Maybe it's more of a problem for me than others, but I find even the act of firing up the sequencer application to be destructive to the creative muse.
So, for example, if sections of an arrangement could be selected simply by the notes you were playing, just like when you play with other people in an improvisational context, that would be cool. If you had MIDI sequences as part of it in addition to audio loops, the system could choose to interpolate and groove between several simultaneous themes, as the Dead used to do. Seems like inevitably you'd need some buttons or pedals or switches to tell the system "faster, slower, louder, softer, DS al Fine, etc." and I'd like to see those handled by some sort of pressure pad right on the guitar's body.
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