SYKK is a pitch modulationeffect. 

The range knob allows everything from subtle chorus and flutter-effects to full on sickening pitch throbs.

• SPEED: speed of the modulation.
• DEPTH: depth of the modulation.
• RANGE: range of the pitchshift (please note that higher settings may cause clicking noises with some signal sources).
• S&H/SINE: Selects between a sample & hold or a sine waveform for the LFO. The sample & hold waveform creates random pitch values at the rate of the speed-knob.