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7. CUTOFF
This knob adjusts the Low Pass Filter Cutoff Frequency. A Low Pass Filter (LPF) allows all overtones
below a specified cutoff frequency to pass through. Thus as you adjust the filter to a lower and lower
cutoff frequency, you cut off more of the high-frequency harmonics (overtones), making the sound
darker, lower, rounder, and more muffled. Of the four tone wave shapes (knob #1), the Square wave
has the most overtone frequencies. This gives the LPF something to work with, so the filter has the most
dramatic effect on square wave tones. The Sine wave theoretically has no overtones at all, and the LPF
has very little effect except at the most extreme settings.
220 Hz 1440 Hz
ALL THESE FREQUENCIES
ARE AUDIBLE
CUTOFF SET AT 100%
220 Hz 1440 Hz
ALL THESE
FREQUENCIES
ARE AUDIBLE
CUTOFF SET AT 0%
Turn Knob #1 full right to select the Square wave shape. Turn Knob #8 Depth full left (zero depth = no
LFO). With Knob #7 Cutoff at full-right, the cutoff frequency is approximately 1440 Hz, which allows
most of the overtones to pass through unaffected, and you hear full, bright sound. As you turn the knob
left, the Cutoff goes down to about 220 Hz, which allows only a very dark, spooky sound to pass
through.