User's Manual

42
The Filters and their Controls
Filters are second only to oscillators in dening the sound of a patch. If the oscillators were
passengers in a car, for example, then the lters are the doors: Some open and close luxuriously
to reveal the occupants; others have more grit and meet a dierent need. The Hydrasynth
lters cover the range from a silky Lamborghini to a rugged Jeep, with all the sophistication
and aggression implied by those extremes. You’re ready for any sort of musical journey with
Hydrasynth.
There are two lters available, each with its own characteristics. They can be used in series, with
Filter 1 feeding Filter 2, or used in parallel, where each lter has a direct path to the output.
Filter 1
This lter is actually a collection of lter types. Each one has its own character, and some may
be similar to analog lters you have encountered. But we didn’t want Hydrasynth to sound
like a clone of any instrument, so we took some of the avor of the original lters and made
something new. As with the oscillators, you will nd that the Hydrasynth lters add their own
signature to the sound.
Filter 1 types
Name Description
LP Ldr12 12dB Uncompensated Ladder lter
LP Ldr24 24dB Uncompensated Ladder lter
LP Fat12 12dB Compensated Ladder lter
LP Fat24 24dB Compensated Ladder lter
LP Gate Low Pass Gate lter
LP MS20 Low Pass lter with an MS-20 air
HP MS20 High Pass lter with an MS-20 air
LP 3-Ler The Low Pass avor of a boutique modular synth
BP 3-Ler The Band Pass avor of a boutique modular synth
HP 3-Ler The High Pass avor of a boutique modular synth
Vowel Vocal formant lter
Compensated vs. Uncompensated filters
Filter compensation could be an unfamiliar concept. It’s another way in which ASM has
adapted the sonic prole of various analog synthesizers. Here’s the dierence:
• Uncompensated lters: As resonance increases the low frequency content of the sound
is reduced.
• Compensated lters: The bass response is not reduced as resonance is increased.
Filter 1 parameters: page 1
All of the Filter 1 types have the same parameters, with one exception as noted. Access
[FILTER 1] and turn Control knob 1 to select the Type, and then adjust these parameters
as needed: