Kurzweil:One-pole Lowpass

From Sonikmatter

The One-pole Lowpass Filter (LOPASS) is a filter that allows low frequency's to pass whilst attenuating high frequency's. This filter (and all single pole filters, for that matter) doesn't have any resonance because there is no internal feedback possible without additional poles.

This filter features 6dB/octave rolloff and the signal is attenuated by 3dB at the cutoff frequency. The resonance can be stated as -3dB (as is done in the manual) but this is really the attenuation of the filter.

This filter can be used to reduce the high frequency conent of a sound, or to make it sound duller. It is a less agressive filter than the standard resonant filters used on countless dance tracks around the world and attenuates the higher frequency's much more gently than higher order filters.

Single pole filters are generally used for control rather than effect of signals, though some interesting effects can by heard by assigning the mod wheel to the cutoff frequency, or by setting velocity and/or key tracking to the cutoff frequency.

Velocity tracking can create a type of random movement of the sound very effectively, both with velocity controlling the amplitude and without, depending upon the desired outcome.

This block uses up only a single DSP Slot.

The Puppeteer 21:33, 30 Jun 2005 (EDT)

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