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User’s Manual Pulse • PulsePlus

8.7 Filter

Once the audio signal leaves the mixer, it is sent to a variable analog low-pass filter. This

filter is a component that has significant influence on the Waldorf Pulse's sound

characteristics.

 A low-pass filter dampens frequencies that lie above a defined cutoff frequency.

Frequencies below this threshold are hardly affected. The frequency range below the

cutoff frequency is called the band-pass range, the frequencies above are called the

stop-band range. The Pulse's filter dampens stop-band frequencies by 24dB per

octave. This means that the volume of a frequency that lies an octave above the cutoff

frequency will be 24dB less than those frequencies of the signal that fall into the

band-pass range. To give you an idea of the extent of dampening, consider this: A

reduction of 24 dB reduces the original volume by approx. 94%. The dampening

factor two octaves above the cutoff frequencies reduces the original volume by more

than 99%, which in most cases means this portion of the signal is no longer audible.

The Pulse's low-pass filter also features a resonance parameter. Resonance in this

context means that a narrow frequency band around the cutoff frequency is

amplified. If this frequency is amplified to a great extent, then the filter will begin

self-oscillation, i.e. the filter oscillates audibly even when it does not receive an

incoming signal.

The parameters of the Pulse filter:

Cutoff 0...127 Determines the cutoff frequency. Tuning is scaled

roughly in semitone steps. At a value of 57 and a

Keytrack value of 32, the filter cutoff frequency is equal

to the pitch of a given MIDI note. If the tuning is not

scaled correctly, please refer to the chapter about the

filter tune function.

Keytrack -64...+63 Allows the filter cutoff frequency to be influenced by

the MIDI note number. Negative values reduce the

cutoff frequency, positive values increase it. A value of

+32 is a equivalent to a ratio of 1:1, i.e. the filter cutoff

frequency changes by an octave for every octave

interval you play. A value of +63 is equivalent to a

change of 200%, all other values change

proportionally, e.g. +16 equals 50%, -32 equals -100%

etc.

Env1 Sens -64...+63 Determines the amount of influence the modulation

source Envelope 1 has on the cutoff frequency.

Velo Sens -64...+63 Determines the amount of influence Envelope 1 has on

the filter cutoff frequency based on key velocity.

Cutoff Mod -64...+63 Determines the amount of modulation.

Source S.00...S.15 Selects the modulation source. Sources are assigned in

the same manner as in the matrix.

Resonance 0...127 Filter resonance parameter.

Cutoff / Keytrack Env1 Sens / Velo Sens Cutoff Mod / Source Resonance

VCF

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 77 78

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Waldorf Pulse Manuel d'utilisateur Page 36

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