The Slope is a simple device with a single section of controls.

Slope controls
Figure 7.19.1: The Slope's controls.

  1. Active: This indicator lights up when the pedal’s effect is active.
  2. Bandwidth: When the “Mode” selector is in band-stop/notch or band-pass modes, this knob sets the amount by which the cutoff frequency of the low-pass and high-pass filters is shifted away from the value set by the frequency knob. Both filters’ cutoff frequencies are shifted away in opposite directions. Its range goes from 300 Hz below for the high-pass filter and above for the low-pass filter at minimum through no shift at center to 300 Hz above for the high-pass filter and below for the low-pass filter at maximum. When the “Mode” selector is in low-pass or high-pass, this knob does nothing. Note: To obtain a true notch frequency response in band-stop/notch mode, this knob should be set to 0 Hz.
  3. Mix: This knob sets the ratio of dry to wet signal linearly from dry signal only at minimum through equal parts dry and wet signal at center to wet signal only at maximum. Note: For positions other that the minimum and maximum, the mix slightly attenuates the frequency range where both signals’ spectrum intersect.
  4. Mode: This selector sets the frequency response of the effect pedal. The options include low-pass, high-pass, band-stop/notch and band-pass. Note: The band-stop/notch and band-pass frequency responses are implemented by connecting the low-pass and the high-pass filters in parallel and in series respectively.
  5. Frequency: This knob sets the cutoff frequency of the filter in low-pass or high-pass mode and the center frequency of the passband in band-pass mode between 18 Hz at minimum to 10 KHz at maximum.
  6. Resonance: This knob sets the amount of resonance of the filter from no resonance at minimum to full resonance at maximum. Note: If the input signal has frequency components equivalent to the cutoff frequency, the filter can self-oscillate at maximum level.
  7. Active: This switch activates the pedal’s effect. When this switch is off, the input signal bypasses the effect and is output unaltered.


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