This big brother of the Phase 90 offers an even broader range of sounds. Along with the speed control there is a 4-position rotary switch that selects between four different intensities, defined as preset waveform patterns. Great for guitar, bass, keys, vocals, and more. Power: Dunlop ECB-03E AC Adapter or single 9 volt battery.
 
https://www.youtube.com/watch?v=2EkgNPIvAi0&feature=youtu.be