Best of Reaktor User Library April 2.007


Dynamic Stereo Expander v1.0
By Andrew Jerrim

Create a dynamic stereo image from a mono input

This instrument uses a push-pull method to achieve a subtle stereo effect that reacts to the dynamics of the signal. Sounds that are louder than the “fulcrum” level are pushed to the left, while quieter sounds are pulled to the right.

From an idea by Michael Paul Stavrou in his excellent book "Mixing with your mind." Check it out at


Echo Tools v1.1
By Andrew Jerrim

Tools to help you tune your reverb & delay effects

This package consists of two tools:

- Echo Sounder - generates pulsed pink noise to reveal the structure of your reverb or echo effect so you can tune it better
- Echo Scope - to visualise the reflections of your reverb or echo effect
You need to set up Echo Sounder as an effect that generates audio into your reverb or echo effect:
- If your effect is set up as a send, the sounder should be placed as an insert on a channel that has a send to your reverb
- If the effect is set up as an insert, then the sounder should be placed as an insert prior to your effect
The Echo Scope can be simply set up as an insert after your effect, or on the master if you're soloing the Echo Sounder channel.
From an idea by Michael Paul Stavrou in his excellent book "Mixing with your mind." Check it out at


jopy fxpack v1.1
By johann meier

Four different boxes for mucking with audio inputs

There are four audio boxes included in this upload. No pictures, but they don't look like much except bog standard Reaktor in my default yellow, grey, and black look. Each ensemble has a detailed description in the instrument itself. There are not any innovative macros here, just new configurations of existing ideas to make new sounds in real time. Hopefully these are easy to figure out and at least somewhat musical; that's my main goal.

JopyMixerbox: A four deck tempo synch'd live sampler or a live mixer, or any combination thereof that you like. Can be used for tweaking a solo guitarist, livening up a few input streams, or just combining samples from a sequenced synthesizer or groovebox on the fly. This was the fastest to build and yet is probably my favorite of the four.

Jopy Filterbox: My attempt to get some of those sequences that I like from Vierring in a simpler, smaller package. It's sequenced bandpass or band reject filters in a mostly graphical input format.

Le Amp Jopy: A new lowpoint in creativity, it's just existing effects put into multi macros, so you can chain them however you want. Features the immortal Toob, Michat's Onehead Tapeecho, Kleinstein, and the Pitch Shifter from the UL. Designed mostly for the Manuel Göttsching or Robert Fripp type guitar performer.

ResoBox: I thought that overlaying four resonators would create a new and different sound, but really, Rick Scott/Rachmiel has some fx units from two or three years ago that sound a lot like this. Still, it's kind of fun for messing about with because it looks and feels a little different.


Simpler Vintape v1.0
By Stefan Knauthe

this is a further development to my first contribution to the Reaktor User Library, the Vintape Ensemble. Development sometimes means simplification, so in Simpler Vintape there's only 1 Wow&Flutter unit, due to some nasty phase shifting that i experienced in the first ensemble. Now the signal path is simpler and the results are a little more predictable.


TransAct v1.0
By Andrew Jerrim

Activate your transients!

This effect lets you modify the dynamics of your sound by emphasising transients or lifting release tails. It works by taking different envelopes off the input and using them to modulate the original signal. It's very useful with percussion and comes in mono and stereo versions.


Loop and Beat Machines

AB99-Expansion Package v1.0
By Stephan V.

Additional Samplers for AB99

This package contains four instruments for expanding my AB99-drumcomputer.

1. a simple drum sampler
2. a 909-snaredrum with original samples
3. a simple loop player
4. a pared down beatslicer

1-3 are triggered by midi-channel 10, 4 is triggered by channel 1.



EOS v1.0
By Don Dailey

hybrid sample glitcher

Glitch Sampler was built following Dave Pape's Reaktor Diary Blog.

My version uses my own samples and
has randomizers for the FM and sample controls. I also left out the delay and filter in favor of Rick Scott's traumDelay. In lieu of reverb, I used a double resonator I made from a single mono res fx I found somewhere. Added randomizers for the tune and mod controls. Swap in your own samples for a whole new sound.



boxStep v1.1
By daniel battaglia

sampler/sequencer combo geared for live performance

boxStep is a QWERTY/MIDI controlled version of the ensemble i use with my monome 40h controller for live performance. it a nutshell, it is a simple stepsequencer (no velocity!) controlling a groove-box-styled sampler, which has alot of sound-mangling features, like filtering, looping, reversing, individual-voice graindelay, etc.

using the QWERTY keys shown on the box, or MIDI notes 48+, you can change the playback "scenes" of both the sampler and the sequencer independantly. the scenes are similar to that used y the R4 ensemble go-box. yes, i am revolting against snapshots. i like tables better! maybe i was dropped on my head as a child! i dont know, but thats how i like it, much faster and more fun for live performance as well.

most controls are labelled. the main thing to remember, is that samples should start mapping at key 0, and that the highest key a sample is mapped to should be set as the value of the numeric control, for proper use of the sample select control. also, for the loop/reverse controls to work the samples loaded must have looping turned on.

enjoy, and send any questions or comments to kid_sputnik over at yahoo dotcom.


PatternPro+ v1.0
By Matthew Todman

Live-ish Drum Pattern Sequencer

Similar to my Pattern+, but with on the fly midi/keyboard pattern selecting via keys (bottom row on keyboard), This has a simple sampler section (keys 2 and 3 control which track is in view) with a the mod part of the sequencer linked to selectable parameters. Ive only included the samples needed for the snap, so dont use the select parameter unless you add you own samples. Theres a jump button (controlled by the S key) which after select a different pattern using keys Z,X.C,V,B,N,M,, will jump back to Bar 1 giving that Beatlookup mashing effect if you program your patterns accordingly.
Theres now mute/solo buttons controled by keys W,E,R,T,Y,U,I,O (use with shift for solo) and reseed buttons (thanks to mjack) which just randomly reseed the steps keeping all mod data intact with the steps. Still has the bar sequencer if you want to use it, and a copy track button which only copies the selected track to paste elsewhere (tip: copy track before reseeding so you can paste the old one back if its rubbish)



stereo monitor v1.0
By James Clark

VU, RMS, Peak meters and Phase Scope

A set of meters to take a careful look at your mix before going platinum.

Includes 2X oversampled RMS and peak meters (oversampling is needed to get a more accurate measure of the peaks in the signal - the digital sample values can be lower than the value that comes out of the D/A). Accurate vU meters with that old time feel are in there too. And to top it all off, a phase scope with correlation meter is provided to make sure your mix doesn't disappear when mixed to mono (for your AM radio hits!).



Filter 1.02 v1.3
By Jonathan Style

2 Osc para/Seri Filters w/saturation.

This is an update to the previous upload Filter


1. Many of the modulation setings are now Bipolar
2.The portamento On/Off is controlled by a logic function. Should be more accurate the before.
3. Relay's have been replaced by Switches.


FM pack v1.0
By johann meier

A pack of four new sequenced/arpeggiator FM synthesizers

There are four FM-based synthesizers included in this upload. I didn't upload a picture, but these synths don't look like much except bog standard Reaktor in my default yellow, grey, and black look. One of these was uploaded to the user library a few months ago, but there have been a lot of changes and improvements over time to improve the sound. The other three are new stuff.

This is a flexible 6-oscillator FM synth. Because of the attached reverb and the nature of the FM operators, it tends to be glassy and metallic sounding. It also allows you to determine which voices will be arpeggiated and which won't; this feature is useful for making modulation patterns. When you have six fm oscillators in Reaktor you use a lot of CPU. Just a warning. A version of this was uploaded earlier, in case it sounds like a familiar concept, although the new version has a better sounding reverb (from Gaugear) and eliminates a lot of unnecessary clutter.

This is a flexible 3-oscillator FM synth. This has much of the functionality of FMSchwein (in fact, it's a stripped down version of the Schwein), but it is more compact and has bandpass filters after each of the oscillators. The filtered signal can be passed to the FM matrix or the out port, increasing flexibility with just the three oscillators; I'm not aware of another Reaktor FM synth that has that functionality, but I might have missed something. Because it's only three oscillators, it's much less CPU intensive than the Schwein.

zen of fm
This is a simplification of the Tao Te FM approach, which is a 4-oscillator FM synth with sequenced formant filters (plus the master filter from Carbon). It can make just about every "musical" noise that the old TTFM could make, and is much faster to use for the goal directed. It's probably best for glitchy sequences and bursts of fwappy noise, but it can make floating pad sounds.

electric jonas
This is a FM synthesizer with four trautonium oscillators. Each oscillator has its own bandpass filter, which helps tame those big trautonium sounds somewhat for FM purposes. It seems to be especially good for making bass-heavy FM which is often hard to achieve with other FM synths, and it also can sound suspiciously like you're tuning a radio through static.


Nord v1.0
By Stephan V.

VA-Monsters Part I

A polyphonic synthesizer similar to a Nord Lead.
- 3 oscs (2 main, 1 sub) with sync & fm
- ringmodulation
- multimode filter (12dB low-, band- and highpass, 24dB lowpass and 12dB lowpass-notch) with adsr-envelope
- amplifier with adsr-envelope and polyphonic or monophonic overdrive
- 2 lfos
- 1 modulation envelope (ad)
- 6-slot modulation matrix (on panel B)
- chorus, phaser and delay effects
- snapshot morphing via mod-wheel

quite simple and low on CPU this has become one of my mostly used synths.


Plastikick v1.0
By Jens Michaelis

A simple, small & smooth oldschool analog kickdrum module

I use this module as a basic kickdrum in electronical productions. It sounds very warm and analogue. The MIDI key is C1. I added three Waveforms, so you can choose, which one you like best! (Go into the samplemap and replace it!)

You will maybe sample your own Waveforms from analogue gear (Moog, ...). The key to sample is C1.


Shredder v1.0
By James Clark

Heavy metal thunder!
Noisy little beast, easy on the CPU. For your heavy metal tracks and gladiator movie soundtracks.


Strontium v1.0
By Daniel Mondry

3osc mono, poly, unison synth.

first osc has 61 waveforms from virus (thanks to Stephan V.).
2 multimode filter serial, parallel.
3 lfos, 2 mod envs and two pattern generators for modulation.
fx-section with chorus, phaser, sync echo (phaser center frq can be controlled via mod matrix).
pwm, simple fm and sync possible.

you can modulate the second lfo´s speed, waveform, width and phase via the other sources.
check that out!
some other features...

i did this mainly for getting a fat unison synth with wide (maybe too much?) modulation possibilitys.
it might need some time to get used to the slightly overcrowded panel, but i think it pays back.

there are still some annoyances with unison (mainly with pan-spread. its not distributed even on both sides)
but my knowledge of this is somewhat limited. help on this would be appreciated.

it would be great, if someone has the time, knowledge and software to design a nicer panel!

i used a lot of nice macros i´ve encountered over the time and put them together in this synth, so lots of credits go to the authors of this macros: Stephan V, the "classic-modular" -authors from NI, martin brinkmann , Erik Wiegand, and many others!

Trautonium three pack v1.1
By johann meier

Pack of three trautonium based synthesizers for your soul

I first started messing around with Trautonium oscillators by accident when touring around core, and I liked the sound so much I made three different synthesizers with them. I also really like the quatsi arpeggiator that Chris List made, so I tend to stick it in a lot of my synths, as you can see in Mia and William. The Trautonium in Reaktor is a comparatively thick sound for a digital synthesizer, and with a few controls you can get quite a bit of throaty sawtooth type variety (for more on Oskar Sala:

Frequent users of the UL might recognize these titles, but trust me, they've all become better with tweaks over time.

electric bruce
This trautonium-esque synthesizer is a bread-and-butter machine for pads, leads, and arps. It's not especially innovative, but it sounds subjectively "warm" and it's very simple to operate, so you don't end up drowning in knobs and buttons. It's sorta retro too, especially now that it has a Solina-type chorus that was made by Hugo Portillo, and of course, the Toob distortion.

electric mia
This synth combines two trautonium-esque oscs with FM and arpeggiators for soundscaping and isn't really at all bad for making thick pads that have a little more bite than you can get with Electric Bruce. This one is on its third or fourth iteration, and it keeps getting simpler and prettier sounding.

electric william
This is a ringmod based synthesizer with two simultaneous arpeggiators that can run at different tempi. It's also useable as an FX unit with audio in, such that it ringmodulates incoming audio against the complex arpeggiators. It's mostly a bleep and blopp machine as I've used it, but it can do a lot more that my presets don't even get to, because I needed to leave something for people to mess around with independently. The ringmodulator saturates the signal at high input levels, which gives it (to my ears) a classic 1960's experimental electronic sound. For more variety in audio, I also borrowed the Numalik (by Pierre-Andre Soulier) wavetables which makes for lots of new audio possibilities.


Viral Extinction v1.0
By Stephan V.

VA-Monsters Part II

Another polysynth similar to an Access Virus A.
- 3 oscs (2 main, 1 sub) with sync & fm, saw, pulse, triangle, sine and 62 original virus waveforms
- 2 fully independent multimode filters (low-, high-, bandpass and bandstop) with adstr-envelope (t=sustain time), different serial and parallel routing options
- saturation stage between the filters with 4 saturation types
- amplifier with adstr-envelope
- 2 lfos
- 3-slot modulation matrix (on panel B)
- low boost, chorus and delay effects (on panel B)

It´s a bit more sophisticated than Nord with more sonic capabilities, but it needs therefore more CPU (~16-20% on a 1,8GHz Athlon).