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Filter 2
Filter 2 is our adaptation of a classic 2-pole state-variable filter. True to form, Filter 2 can toggle
between two filter types: Low Pass / Band Pass / High Pass, and Low Pass / Notch / High Pass.
Each provides a perfect complement to Filter 1.
The filters can be used in Series or Parallel.
This setting is found on page 2 of Filter 1.
Filter 2 parameters
Control knob Parameter
Range
Description
1
Type
LP-BP-HP,
LP-NO-HP
Selects filter type
2
Morph
0.0-128.0
Adjusts filter: 0 = LP, 64 = BP or NO, 128 = HP,
with gradual changes
3
Cutoff
0.0-128.0
Cutoff frequency
4
Resonance
0.0-128.0
Controls resonance or Q
5
ENV 1 /- 64.0
Sets amount and polarity of Envelope 1 effect on
filter
6
LFO 1 /- 64.0
Sets amount and polarity of LFO 1 effect on filter
7
Vel Env
+/- 64.0
Allows velocity to set maximum range of filter
envelope
8
Keytrack
+/- 200%
Scales filter response across keyboard; C2 =
center note
Filter 2 Types
Filter 2 provides two filter types, each with
Low Pass and High Pass modes to process
the high and low frequencies. The major
difference is what happens in the middle, as
Morph approaches a value of 64:
• Band Pass emphasizes the middle
frequencies, in a range defined by the
Resonance setting.
• Notch reduces the middle frequencies, in a
range defined by the Resonance setting.
The differences are more pronounced with
higher resonance values. You’ll also notice that
the Band Pass and Notch filters affect the Low
Pass and High Pass modes differently as you
sweep the filter frequency. Between these two
filter types the Hydrasynth Deluxe can achieve
an astonishing variety of sounds.
Morph
This parameter adjusts the filter between its
various states, with a Low Pass filter at one
extreme, a High Pass filter at the other, and a
Band Pass or Notch filter at the middle setting.
Along the way there are hundreds of interme-
diate settings. As the value changes, a graphic
indicates the filter character.
When Filter 2 is selected on the top panel, the
Morph parameter is shared with the Drive /
Morph knob in the Filter Controls section.
The rest of the Page 1 parameters are identical
in function to the same parameters in Filter 1
(Cutoff, Resonance, ENV 1 amount, LFO 1
amount, Velocity, and Keytrack). Please refer
to
Filter 1 parameters: page 1 (p. 50)
for their
descriptions.
Set up mod routes quickly from an Envelope or LFO to the Filter: Hold the module
button for the desired source, then press the module button for the destination.