As others have said, it was probably a Roland GR-series unit connected to a guitar with a hexaphonic pickup. If you're a computer-based musician, an excellent

As others have said, it was probably a Roland GR-series unit connected to a guitar with a hexaphonic pickup. If you're a computer-based musician, an excellent option is Jam Origin's Midi Guitar 2. It's a pure software solution that accepts any guitar as an input. It works polyphonically, has low latency and tracks the notes with remarkable accuracy. https://www.jamorigin.com/ https://www.jamorigin.com/