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Synthesizer for creating unusual sounds and soulful distortions

(190 Votes)
2.2 (Updated 12 years ago)
March 26, 2008
Reaktor 5 or lower


The idea is to first generate a relatively simple waveform, expand its complexity by the multiplier and then attenuate individual frequencies by the filter bank. A downstream P52 filter, master envelope and chorus give the sound a final polish. A manual is included in the download.

The heart of the inFiltrator are two musically highly effective (but surprisingly seldom used) modules:
a wave multiplier and a filter bank. Both are extended implementations of the Doepfer modules A-137 and A-128, respectively.

Usage of Dual Knobs:
Click-Draw in the center region to modify the inner knob (main parameter). Left and right regions are for the outer knob (modulation amount). Double-click in either region resets the knob and value to its default.
Right-click the little squares below the knob to invoke MIDI Learn. The left square is for the inner knob, the right one for the outer.
(Feature Request to NI: Please enable MIDI control of Mouse Areas, analog to XY-Fields!)

- Andy Wilmer for inspiring discussions. (He's a genuine modular freak!)
- Daniel Scholz, whose Reaktor implementation of the A-128 was the basis for my filter bank.
- Anonymous for the dual knobs which I further adapted to my needs. (His/her original ensemble "ontotheham" is not signed, unfortunately)
- Don Dailey for his terrific snaps (check out the separate bank included in the ensemble!).

THANKS for your feedback!!!


Version 2.2:
Re-designed the LFO section. Now it works as in Shark 3. With the "Sync" button checked, the Speed knob snaps to integers and inverse integers of the host tempo.

Version 2.1:
Fixed some bugs that sabotaged polyphonic mode.


For thos who own Kore 2: I have created koresounds for the inFiltrator, including Controller pages for all elements. They can be downloaded at


9 years ago
I like this. A very wide range of sounds are possible.
John Leach
11 years ago
Wow. I didn't see what the fuss was about at first but with minimal tweaking I fell pretty hard for this.
Raymond Szwec
12 years ago
thanks for bringing some fresh sounds and textures with this and Shark
Sandy Small
12 years ago
Superb work! This is the most creative synth architecture I've seen in a long time.
Michael Barker
12 years ago
Fantastic - thanks again - I've been working alot with Shark since you posted it, and now this... very generous of you.
Bagnoud Hervé
12 years ago
Kimmo Kivelä
12 years ago
I have to check closely to the insides how this is made. 10.
Jason Bundy
12 years ago
Absolutely stunning! This and Shark are perfect for what I do. Thank you!
Kim Joris Boström
12 years ago
Check out Don Dailey's fresh snaps! I love them!
shawn gilbert
12 years ago
Thank you for all of your time and effort.10!
shawn gilbert
12 years ago
No offense,but you just keep getting better and better and...
Zip Boterbloem
12 years ago
Interesting sound, different from most analogue imitations
Simon Simon Hunt
12 years ago
Nice, thanks!
David Waldman
12 years ago
SICK SICK SICK SICK SICK. I will now make you a sammich.
Don Dailey
12 years ago
clever. Very nice set of snaps.
Ryan Dean
12 years ago
Thanks so much for your gorgeous synths! Those API knobs are really fuggin slick looking. I initally overlooked Shark, but I wont make that mistake again.