User Manual

46
Filter 2
Filter 2 is our adaptation of a classic 2-pole state-variable lter. True to form, Filter 2 can toggle
between two lter 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 lter type
2 Morph 0.0-128.0 Adjusts lter: 0 = LP, 64 = BP or NO, 128 = HP,
with gradual changes
3 Cuto 0.0-128.0 Cuto frequency
4 Resonance 0.0-128.0 Controls resonance or Q
5 ENV 1 amount +/- 64.0 Sets amount and polarity of Envelope 1 eect on
lter
6 LFO 1 amount +/- 64.0 Sets amount and polarity of LFO 1 eect on lter
7 Vel Env +/- 64.0 Allows velocity to set maximum range of lter
envelope
8 Keytrack +/- 200% Scales lter response across keyboard; C2 =
center note
Filter 2 Types
Filter 2 provides two lter types, each with
Low Pass and High Pass modes to process
the high and low frequencies. The major
dierence is what happens in the middle, as
Morph approaches a value of 64:
• Band Pass emphasizes the middle
frequencies, in a range dened by the
Resonance setting.
• Notch reduces the middle frequencies, in a
range dened by the Resonance setting.
The dierences are more pronounced with
higher resonance values. You’ll also notice
that the Band Pass and Notch lters aect the
Low Pass and High Pass modes dierently as
you sweep the lter frequency. Between these
two lter types the Hydrasynth can achieve an
astonishing variety of sounds.
Morph
This parameter adjusts the lter between its
various states, with a Low Pass lter at one
extreme, a High Pass lter at the other, and a
Band Pass or Notch lter at the middle setting.
Along the way there are hundreds of interme-
diate settings. As the value changes, a graphic
indicates the lter 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 (Cuto, Resonance, ENV 1 amount, LFO 1
amount, Velocity, and Keytrack). Please refer
to Filter 1 parameters: page 1 (p. 43) 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.