The Filter

The filter is processed in the same display area, in which also the oscillators are edited. For the filter the following adjustments are possible:

 

 

parameter Range Explanation
Filtertype LP6...24 The filter can act as Low-Pass(LP), High-Pass (HP) or Band-Pass filter (BP) with 6 (1st order), 12 (2nd order) and 24 (4th order). Filters of a higher order operate "harder" and cut the frequency band more sharply, while e.g. a 6dB filter changes the sound very gently.
Cutoff 20...20.000 Hz The filter frequency within the area of the human hearing scope, a low-pass filter with a cut off frequency of 20.000 Hz hardly changes the sound, while a high-pass filter of 20.000 cycles per second lets practically no more oscillation be noticeable.

Attention: The filter envelope always covers the range between the selected cutoff frequency and 20.000 Hz. If you i.e. choose 2000 Hz cutoff then an envelope level of 0 represents 2000 Hz, an envelope level of 100 represents 20.000 Hz (as always). So the cutoff parameter determines the possible depth of the filter envelope modulation.

Resonance 0...100 Accentuation of the frequency around the filter frequency.

 

GakStoar delta has
  • 2 individual filters per voice
  • high-, low- and bandpass mode
  • up to 36 db/Octave
  • variable keyboard scaling
  • and more ...