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Citation : With the EF-303 Groove Effects, Roland opens the doors of professional effects processing to DJ’s and musicians of all types. Through its intuitive, realtime controls and groove-oriented algorithms—including a built-in DSP monosynth with Step Modulator, plus extensive MIDI control capabilities—the EF-303 is capable of just about anything imaginable.

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Tabletop effects processor for DJ’s, remixers and musicians
16 synchronizable effects algorithms; built-in DSP monosynth
Intuitive design; 4 control knobs, 16 sliders and Grab switch
Automatic BPM counter and MIDI start/stop control
Step Modulator for programming complex effect changes
16 Patch memories store effect settings, Step Modulator patterns\
Accommodates a variety of input sources ; MIDI In/Out