The Boss SYB-5 Bass Synthesizer builds on the classic SYB-3 which was the world’s first bass synthesizer to be packed into a compact pedal. The SYB-5 uses the latest in Digital signal processing technology to reproduce the classic sound characteristics of analog synthesizers and also enable enhanced punch and power. There are 11 DSP variations of saw, square, and pulse synth waves, and Enhanced Wave Shape mode provides sharper sounds. You can hold notes with the pedal and jam over the top. An EV-5 expression pedal allows you to control filter cutoff and LFO rate and is sold separately.