 Pickup switching, volume and tone controls were completely digital, powered by a large internal motherboard.The player selected pickups via five pushbuttons; volume, treble and bass were incremented numerically via digital rocker switches, confirmed by a three-colour LED readout.The guitar required an external power supply pack and given the state of engineering at the time, was relatively bulky; it never really caught on in the marketplace and only about 1400 units were ever manufactured.