A power supply is also included with the Dave Smith Instruments Mopho keyboard. The Mopho Keyboard’s voice architecture features two oscillators, two sub-octave generators, selectable 2- or 4-pole low-pass filter, feedback, and a ton of modulation options, including three envelope generators, four LFOs, and a 16 x 4 step sequencer. It has a full-sized, semi-weighted, 32-note keyboard with velocity and aftertouch and full-sized pitch and modulation wheels. The Poly Chain feature enables expanded polyphony using other DSI synths. For example, combining a Mopho Keyboard with a Tetra results in a very portable five-voice poly synth. Other features include USB and the ability to process external audio through Mopho’s filter and VCA.