Filter Tab
 Filter Mode
The buttons on the left determine the overall filter structure.
Single Filter uses one filter with one selectable filter shape.
Dual Filter Serial uses two separate filters connected in series.
You can select the filter shapes for each filter independently. The parameters Cutoff and Resonance control both filters simultaneously. However, you can offset these parameters for the second filter with the parameters CF Offset and Res Offset.
Dual Filter Parallel uses two separate filters connected in parallel.
You can select the filter shapes for each filter independently. The parameters Cutoff and Resonance control both filters simultaneously. However, you can offset these parameters for the second filter with the parameters CF Offset and Res Offset.
Morph 2 morphs between filter shape A and B.
Adjust the morphing with the Morph Y parameter.
Morph 4 morphs sequentially from filter shape A to D.
Adjust the morphing with the Morph Y parameter.
Morph XY morphs freely between the filter shapes A, B, C, and D.
Adjust the morphing with the Morph X and Morph Y parameters.
 Filter Type
Specifies the basic sound character of the filter.
Off deactivates the filter section.
Classic offers 24 filter shapes with resonance.
Tube Drive adds warm, tubelike distortion. You can set the amount of tube drive with the Distortion parameter.
Hard Clip adds bright, transistorlike distortion. You can set the amount of hard clipping with the Distortion parameter.
Bit Red (Bit Reduction) adds digital distortion by means of quantization noise. You can adjust the bit reduction with the Distortion parameter.
Rate Red adds digital distortion by means of aliasing. You can adjust the rate reduction with the Distortion parameter.
Rate Red KF adds digital distortion by means of aliasing. In addition, Key Follow is used. The rate reduction follows the keyboard, so the higher you play, the higher the sample rate.

HALion 3 offers the five legacy filter shapes from HALion 3.

Waldorf offers 13 filter shapes, including two comb filters.

Eco is a performanceoptimized lowpass filter without Resonance or Distortion parameters. It allows you to adapt the brilliance of samples for different velocity layers of the same key, for example.
NoteFilters without distortion use less processing power.
 Filter Shape
LP 24, 18, 12, and 6 are lowpass filters with 24, 18, 12, and 6 dB/oct. Frequencies above the cutoff are attenuated.
BP 12 and BP 24 are bandpass filters with 12 and 24 dB/oct. Frequencies below and above the cutoff are attenuated.
HP 6+LP 18 and HP 6+LP 12 are combinations of a highpass filter with 6 dB/oct and a lowpass filter with 18 and 12 dB/oct, respectively (asymmetric bandpass filter). Frequencies below and above the cutoff are attenuated. Attenuation is more pronounced for the frequencies above the cutoff.
HP 12+LP 6 and HP 18+LP 6 are combinations of a highpass filter with 12 and 18 dB/oct and a lowpass filter with 6 dB/oct (asymmetric bandpass filter). Frequencies below and above the cutoff are attenuated. Attenuation is more pronounced for the frequencies below the cutoff.
HP 24, 18, 12, and 6 are highpass filters with 24, 18, 12, and 6 dB/oct. Frequencies below the cutoff are attenuated.
BR 12 and BR 24 are bandreject filters with 12 and 24 dB/oct. Frequencies around the cutoff are attenuated.
BR 12+LP 6 and BR 12+LP 12 are combinations of a bandreject filter with 12 dB/oct and a lowpass filter with 6 and 12 dB/oct, respectively. Frequencies around and above the cutoff are attenuated.
BP 12+BR 12 is a bandpass filter with 12 dB/oct plus a bandreject filter with 12 dB/oct. Frequencies below, above, and around the cutoff are attenuated.
HP 6+BR 12 and HP 12+BR 12 are combinations of a highpass filter with 6 and 12 dB/oct and a bandreject filter with 12 dB/oct. Frequencies below and around the cutoff are attenuated.
AP is an allpass filter with 18 dB/oct. Frequencies around the cutoff are attenuated.
AP+LP 6 is an allpass filter with 18 dB/oct plus a lowpass filter with 6 dB/oct. Frequencies around and above the cutoff are attenuated.
HP 6+AP is a highpass filter with 6 dB/oct plus an allpass filter with 18 dB/oct. Frequencies around and below the cutoff are attenuated.
 X/Y Control
Allows you to adjust two parameters simultaneously.
For the filter types Single, Dual Serial, and Dual Parallel, the X/Y control adjusts the cutoff frequency on the horizontal axis and the resonance on the vertical axis.
For the filter types Morph 2 and Morph 4, the X/Y control adjusts the morphing between the filter shapes on the vertical axis. The horizontal axis adjusts the cutoff frequency.
For Morph XY, the X/Y control adjusts the morphing between the filter shapes AD and BC on the horizontal axis, and AB and DC on the vertical axis.
 Cutoff
Controls the cutoff frequency of the filter.
 Resonance
Emphasizes the frequencies around the cutoff. At higher settings, the filter selfoscillates, which results in a ringing tone.
 Distortion

Adds distortion to the signal. The effect depends largely on the selected filter type. At higher settings, it creates a very intense distortion effect.
NoteThis parameter is only available for the filter types Tube Drive, Hard Clip, Bit Red, Rate Red, and Rate Red KF.
 CF Offset
For the dual filters, this parameter allows you to offset the cutoff frequency of the second filter, that is, of filter shape B.
 Res Offset
For the dual filters, this parameter allows you to offset the resonance of the second filter, that is, of filter shape B.
 Cutoff Velocity
Controls the cutoff modulation from velocity.
 Envelope Amount
Controls the cutoff modulation from the filter envelope.
 Cutoff Key Follow
Adjusts the cutoff modulation using the note number. Increase this parameter to raise the cutoff with higher notes. At 100 %, the cutoff follows the played pitch exactly.
 Center Key
Specifies the MIDI note that is used as the central position for the Key Follow function.