Regen - Alesis ModFX Reference Manual

3
Using the Philtre

Regen

The [REGEN] knob does several different things depending on
the filter type. But in each filter it increases the amount of filter
resonance (how much gain is added near the corner frequency),
which creates a peak in the response as shown below:
[REGEN] at minimum
[REGEN] at maximum
• To increase resonance, turn [REGEN] clockwise.
• For no resonance (REGEN off), turn [REGEN] counter-
clockwise.
Regen in Band Pass and Band Stop modes
In addition to its resonance function, the [REGEN] knob adjusts
the width of the bands in Band Pass and Band Stop filters.
In BAND PASS mode, with [REGEN] set to minimum, the high
and low corners of the band are extremely far apart, so that on
program material without much low or high end there may be little
audible effect (depending on the setting of the PHREEQ knob).
As you increase the [REGEN] setting, the low pass filter corner
moves down, and the high pass filter moves down, making the
middle "plateau" narrower and narrower. At the maximum
[REGEN] setting, with the addition of filter resonance, the Band
Pass filter essentially becomes a narrow notch filter with a very
high "Q":
Band Pass: Low [REGEN]
• To make the band narrower, turn [REGEN] clockwise.
30
Band Pass: High [REGEN]