Lowpass Tweaked biquad lowpass filter
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filter Module SynthEdit Module SynthEdit lowpass filter lowpass biquad filter biquad eq biquad lowpass effect tweaked

Lowpass Description

The Lowpass SynthEdit module was developed to be a tweaked biquad lowpass filter. My attempt was to tweak and optimize a biquad filter for performance and fast modulation at the expense of frequency range. Eventually, the performance results are not very notable, and the stability got even worse. The filter blows up easily with fast modulation and high resonance settings. However, I decided to release this module, because it has decibel resonance setting, and variable resolution. It is very similar to DH_MultiFilter2, with a bit of a 'state variable' touch, the high frequencies being slightly boosted. ParametersPitch:Due to optimizations in the calculation, frequency range is limited to 20 Hz .. 11025 Hz. Resonance: Set in decibels. Resonance = 0 means gain is -3dB at cutoff frequency, so in 12dB mode it behaves as a Butterworth filter. Usual range is about -10 .. 60. Slope: 24dB mode is the same as cascading two 12dB filters in serial. It has a steeper rolloff slope, and a wider resonance peak. Freq Scale: As usual, 1 Volt/kHz selects linear frequency scale, 1 Volt/Octave selects exponential frequency scale. Resolution: Sets the update rate of the filter. Instant means audio rate resolution, which is best for very fast modulation, but also more CPU use. If there's no fast modulation, you can set it to lower to save CPU. NotesPlease note that the filter may blow up with fast modulation and high resonance settings. For such settings, another filter may be a better choice. Also, cascading more modules for even steeper slope is not suggested, because this would boost high frequencies, similar to the effect of cascading state variable filters.

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