Version 2 Filters
See the Version 1 Filters page for information on the terminology used to describe filters, their controls, etc. An additional control not found in the Version 1 Filters is the Key-follow control, used in many of the 'bigger' version 1 filters. This allows you to alter the Cut Off frequency of the filter to track keyboard position, so that the frequency can be raised (or lowered) as you play higher up the keyboard.
The figure after the name of each filter represents the percentage of one DSP chip used by each module. Taken from Robin Chard's DSP usage chart.
6db High-Pass Filter (1.1%)
|Low DSP 1pole high pass filter with Cut Off control only - No modulation input and no resonance control.|
|6db Low-Pass Filter (1.2%)||
|As above, but Low Pass version.|
|12db High Shelf EQ (1.4%)||
|This filter works by cutting or boosting the frequencies above the cut off frequency. Set the cut Off value, and then cut or boost according to the gain value.|
|12db Low Shelf EQ (1.4%)|
|As above, but the frequencies below the cut off frequency are cut or boosted.|
|12db Multi-Mode Filter (2.4%)||
|2 pole filter with separate outputs for High, Low and Band pass.|
|18db Low-Pass Filter (4.0%)||
|3pole Low pass filter. Two Cut Off frequency modulation inputs and a keyfollow Modulation input.|
24db Low-Pass Filter (6.3%)
|4 pole Lowpass filter with Keyfollow, Resonance and (2*) Cut Off Modulation options.|
|24db High-Pass Filter (6.4%)||
|As above, but High Pass Filter.|
|24db Low-Pass 'Vintage' Filter (6.3%)|
|Vintage version of the above 24db/Octave Lowpass filter. The vintage characteristic is that the level of the signal is unchanged, even at high resonance settings.|
|24db Low-Pass 'Retro' Filter (5.4%)|
|A 'Retro' version of the the above 24db/Octave High Pass filter - It can go into self modulation at high resonance, even when no input signal is present. Modulation inputs for Key follow, Resonance & (2* ) Cut Off frequency.|
|24db High-Pass 'Retro' Filter (5.4%)|
|As above - High Pass version.|
|24db Band-Pass 'Retro' Filter (5.4%)|
|As above - Band Pass version.|
|Multi-Mode Filter A (8.3%)|
|Can be switched between 12db & 24db/Octave and between High Pass, Low Pass and Band Pass modes. Modulation inputs for Key follow, Resonance & (2* ) Cut Off frequency.|
|Multi-Mode Filter B (4.8%)|
|12db/Octave filter with three parallel outputs - High, Low and Bandpass. Modulation inputs for Key follow, & (2* ) Cut Off frequency.|
|Comb Filter A (8.3%)|
Comb filters work by attenuating parallel bands of frequency from the signal. The version A comb filter removes large bands of the signal, allowing only narrow bands of the spectrum through.
The Damp parameter controls the amount of feedback sent back to the filter - this in turn has an effect on the resonant characteristics of the filter.
There are modulation inputs for Cut Off frequency (*2) Key follow, Resonance and Damp.
|Comb Filter B (7.8%)|
|The version B comb filter removes steeper bands from the signal than version A, hence allowing more frequencies through untouched. Otherwise the filter controls are the same as version A.|
|UKnow Filter (6.3%)|
|Like the Uknow Low Pass/High Pass - ResMod in version 1, this filter combines a 12db/Octave Low Pass resonant filter with a non-resonant High Pass filter. All the controls except HPF relate to the Low Pass filter only. Usual modulation inputs for Cut Off frequency (*2) Key follow& Resonance.|
|Vocal Filter (7.2%)|
This module filters signals such that the formants for the vowels A, E, 0 - and many others - are applied. You can select from among 10 vowel sounds distributed over 5 positions. By stepping through the positions (selected vowels), which can be done via modulation, the filter begins to ‘speak’. The vocal filter also offers adjustable resonance, and a frequency offset for shifting the formants.
The following vowel sounds are available:
A, E, I, O, U, Y, AA, AE, OE, and UE.
It works as follows - You assign any of the above vowels to each of the 5 vowel positions. You then set the initial vowel position using the rotary knob. You can then morph from one vowel position to another by modulating the Vocal position, using either of the Modulation inputs. You can also change the vocal position according to note value by using the VP Key follow modulation control.
There is also a frequency offset control which shifts the formant of the vowel up the frequency scale.
The FM control modifies the strength of the modulation signals over the Frequency Offset.
See the CW factory patch 'Vocal Patch' for an example implementation of this filter.
|Free Filter Bank A (25.4%)|
|12 separate frequency bands can be specified, and then boosted of cut individually. The Q control affects the whole filter, as does the Gain control.|
|Free Filter Bank B (11.4%)|
|As above, but with 5 bands only.|
|Parametric EQ (1.9%)|
|A 12db/Octave filter which boosts or cuts a range frequencies around a specified cut off frequency. The filter curve is bell-shaped, and has a Q control which affects the slope and range of the filter.|