We recently reviewed the i2M audio MIDI interface, which works amazingly well in a monophonic capacity. But if you need polyphony with perfect tracking all the time. The best solution is still a fretboard controller.
Perhaps you remember the SynthAxe: a synthesizer controller constructed roughly in the shape of a guitar, where notes were triggered by pushing down rows of buttons arranged like frets on a fingerboard? Between the average guitarist’s lack of interest in all things synthesizer and a price tag of $8-$13,000 dollars, it is no wonder it never caught on—Allan Holdsworth notwithstanding. But for the last couple of Winter NAMM shows, two companies have been showing products that recall this relic of the Eighties. Misa Digital and You Rock Digital are betting that the increased interest of guitarists in all things digital, combined with a lower price point can revive the concept.