A very cool (if also quite bonkers) piece of history, this is essentially a guitar synth/fuzz/octave effect unit; however it can also produce interesting results with other instruments as well. Capable of some amazing effects, beats, textures and wild out-there sounds – works brilliantly with guitar, bass, synth and all sorts of sources. Tested – it’s in excellent working order and very good condition indeed. Whilst it tracks reasonably well, please bear in mind that this is vintage analogue technology so requires more precise playing than modern octave/synth pedals for the bass section to be effective. The percussion section is just crazy – there’s nothing like hitting your guitar strings to play the bongos… The tambourine is especially good – one of the best we’ve heard: very 60s. Go online and check out the many videos of this wild unit. Kind of the first of its' kind in mixing multi effects and percussion. These are very collectable. This model is the G-1 which is much rarer than the later G-2. Original case in great shape also included. Since this is a vintage unit, all sales are VERY final. No expressed or implied warranties. Thanks.