Low pass and high pass
Filters1, 2 and 4 poles · cutoffA low pass lets the partials below its cutoff through and turns down the ones above; a high pass does the opposite. How steeply depends on its poles: a 1-pole LOPASS falls 6 dB an octave, the 2POLE LOWPASS 12 dB, the 4-pole filters 24 dB. The cutoff is a row like any other: a note and its Hz, moved in cents.
SEE IT MOVE
Computed in your browser with KINSPIRATION's DSP functions, sample by sample, their Pads at the factory's defaults.
WHAT TO KNOW
THE FAMILY
LOPASS and HIPASS take one block, 2POLE LOWPASS and 2POLE HIPASS two, 4POLE LOPASS W/SEP, 4POLE HIPASS W/SEP and 4POLE MOGUE LP all four.
THE SLOPE
Above the cutoff a low pass falls 6 dB an octave a pole. The red curve on the left is the filter; the dots, the KEY's partials before and after it.
USE IT FOR
Brightness: a low pass under a slider, an envelope or velocity; a high pass to thin a sound out or take the rumble from its lowest notes.
WATCH OUT
A cutoff below the note's own pitch leaves only a faint fundamental: KeyTrk 100 cents a key keeps the filter in the same place for every note.
IN THE FACTORY PROGRAMS
The factory's low and high passes: the 2POLE LOWPASS in 4,722 layers (median cutoff 415 Hz), the 1-pole LOPASS in 1,976 (2.49 kHz), the HIPASS in 983 (175 Hz).
THE LOW AND HIGH PASSES
FIND THEM ON YOUR K2700
HOW TO ON YOUR K2700 · 673 1-Note PowerRiff
1-Note PowerRiff's second layer has a 2POLE LOWPASS and a HIPASS: find their cutoffs and move one.
In Program mode choose 673 1-Note PowerRiff (KEYPAD, 673, ENTER).
Press EDIT, go to layer 2 with CHANNEL/LAYER ▲, then MORE and DSP CTL. The LP Frq row is F#4 370 Hz, the 2POLE LOWPASS's cutoff, with KeyTrk 100 ct/key.
With the cursor on it turn the Alpha Wheel twelve steps up, to F#5 740 Hz: a semitone a step, the filter an octave higher and the sound brighter.
Down on the HP Frq row, E 3 165 Hz: the HIPASS in F3, its cutoff.
Press EXIT and answer NO to leave the factory program as it was, or SAVE to keep your version on a USER ID.