Check the listing for details. Keeley Synth1 Wave Generator Guitar Effects Pedal. Condition: New. Listed at 179.00 USD. The Keeley Synth-1 is a guitar-triggered, single-note wave generator. You control the tone of the wave with the Filter control. The lead-in time or swell of the note is controlled with the Attack knob. Then use the Blend control to remove the natural tone from your guitar as you slide through synth-sounding fuzz waves. Use an expression pedal to control the Filter, and now you have wah-wah-like control of the Synth-1.