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KOACH · DSP functions · Lesson 2 of 7

Resonance and Drive

FiltersLP Res · Drive · the Mogue

The 2-pole and 4-pole filters have a resonance: dB of boost (or cut) right at the cutoff. Negative values round the corner off, 0 dB is plain, +12 to +24 dB is the sharp, singing peak of a synth filter. Drive, on the 2-pole's resonance page, pushes the signal into the filter harder, and its output saturates.

SEE IT MOVE

THE FUNCTION ITSELF
THE SOUND AT THE OUTPUT
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Computed in your browser with KINSPIRATION's DSP functions, sample by sample, their Pads at the factory's defaults.

WHAT TO KNOW

THE PEAK

LP Res is the level at the cutoff: −6 dB is two plain 1-pole stages, +12 dB a clear peak, +24 dB close to ringing.

DRIVE

0 to 3 steps of 6 dB into the 2POLE LOWPASS or HIPASS; the filter's output saturates softly, and its level is given back.

THE MOGUE

4POLE MOGUE LP is a transistor ladder: 24 dB an octave, its resonance −6 to +12 dB, the loudest settings close to self-oscillation.

WATCH OUT

A strong peak on a loud partial clips: lower the input with the Pad, or the resonance, when a sweep turns harsh.

IN THE FACTORY PROGRAMS

Of 4,564 2POLE LOWPASS settings, 2,996 have no resonance, 843 a rounded corner and 120 a peak of 12 dB or more; the 4POLE MOGUE LP plays 405 layers.

2POLE LOWPASS RESONANCE

below 0 dB843
0 dB2996
1 to 11 dB605
12 dB and up120

FIND THEM ON YOUR K2700

709 AcidJazzFlutelayer 3 · 2POLE LOWPASS 2.09 kHz, Res 16 dB
733 Sax Sectionlayer 5 · 2POLE LOWPASS 2.09 kHz, Res 16 dB
736 Tenor Expresslayer 5 · 2POLE LOWPASS 2.09 kHz, Res 16 dB
111 Deep Fuzzlayer 1 · 2POLE LOWPASS 22 Hz, Res 16 dB
123 PCell WAH Clavlayer 1 · 2POLE LOWPASS 294 Hz, Res 18.5 dB
916 Big Woosh Kitlayer 11 · 2POLE LOWPASS 233 Hz, Res 15 dB

HOW TO ON YOUR K2700 · 709 AcidJazzFlute

AcidJazzFlute's third layer gives its 2POLE LOWPASS a resonant peak. Find it, then take it down.

  1. In Program mode choose 709 AcidJazzFlute (KEYPAD, 709, ENTER).

    Program mode with 709 AcidJazzFlute

  2. Press EDIT, go to layer 3 with CHANNEL/LAYER ▲, then MORE and DSP CTL. The LP Res row is 16.0 dB: the boost at the cutoff, LP Frq on the row above.

    The DSP CTL page of 709 AcidJazzFlute, layer 3, the cursor on LP Res (16.0 dB)

  3. Turn the Alpha Wheel down, here to 6.0 dB: the peak shrinks; below 0 dB the filter's corner rounds off.

    The DSP CTL page of 709 AcidJazzFlute, layer 3, the cursor on LP Res (6.0 dB)

  4. Press EXIT and answer NO to leave the factory program as it was, or SAVE to keep your version on a USER ID.