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52
Filter 1
> MODE
Select from the following filter types:
> Low Pass:
The most commonly
used filter type. Removes frequen-
cies higher than the cutoff point.
> High Pass:
Removes frequencies
lower than the cutoff point.
> Band Pass:
Allows only a narrow band of frequencies through - Resonance determines the
width of the band in this case.
> Band Stop:
The opposite of Band Pass, this filter removes a narrow band of frequencies.
Often referred to as a 'notch' filter, as it effectively cuts a notch in the tonal spectrum. Res-
onance determines the width of the notch.
> CUTOFF
This determines the frequency above or below which filter 1 will come into effect. For
instance in a Low Pass filter, frequencies below this point are allowed to pass, and those
above are removed according to the slope of the filter.
> LINK (CUTOFF)
Synchronises the cutoff frequencies of both filters. When switched to ON, filter 2 cutoff
tracks filter 1 cutoff. The offset between the two determined by the Filter 2 Cutoff controller.
> RESONANCE
In Low Pass or High Pass modes, this determines the emphasis of those frequencies near to
the cutoff point. As you increase the level it results in a more nasal or 'honking' tone. In Band
Pass and Band Stop modes, increasing the resonance reduces the width of the band.
> ENV AMT
This determines to what degree the cutoff frequency of filter 1 is affected by the filter enve-
lope.
indigo powercore manual.book Page 52 Thursday, April 22, 2004 12:23 PM