Gareth writes: I’ve wanted a Guitar-to-MIDI converter (a.k.a. a guitar synth) for yonks. In particular, I’ve been looking for an Axon AX 100 unit; they were renowned for the speed and accuracy of the tracking that the proprietary neural network software could achieve. Unfortunately the AX 100 has been out of production for years, and used units are commanding prices in the high hundreds of pounds. However, I recently found a reasonably priced spares-or-repair unit on eBay, so I picked it up.