Electro-Harmonix Superego Polyphonic Synth Engine Pedal W/Power AdapterExperience unbelievable elements of sampling, synthesis and infinite sustain. The polyphonic EHX Superego Synth Engine reinvents sample and hold, performs fluid glissandos and creates oscillator like, synthesizer effects. It can stack sounds or create infinite sustain, it even lets you tweak attack and decay, or use its effects loop to invent novel synth patches. Indulge your guilty pleasures. Auto mode captures and freezes notes and chords as you