S y C h r o m e - FBxi

Multi-Wave Additive FM Synthesis
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SyChrome is a six operator multi-wave additive FM synth with extensive modulation and filtering capabilities.


Each operator has two waveform modes, Pure-Parabolic Sine or Triangle-Bipolar Pulse, the pure sine and triangle waves can be FM modulated, the parabolic and bipolar waves can be shaped by altering the waves symmetry and are not affected by FM.

In each mode the FM and none FM waveforms can be crossfaded allowing the fundamental frequency of the operator to remain present in the signal when producing extreme FM modulation.

Each of the 6 operators can be switched-into the main mix and also used as carrier/modulator at the same time, allowing very complex and diverse waveform generation.


This is actually three separate processors that are independently switchable, first in line is Extract.

Extract is four 2-pole filters working against each other to produce a band-pass and a simultaneous band-reject filter, both with resonance, by adjusting the high and low dials the filters will create a band-pass state, the filters can be crossfaded over to produce a band-reject state filter.

The output of both the high and low filters are then passed onto two mono phasers each with its own extended LFO modulation and feedback control.

V2 adds MIDI key tracking and extended LFO modulation to the extract filters, plus output gain and pan.


Shaper Six is a combined Multi-Mode Filter and EG.

This is a six stage EG design with two decays and a variable slope.

The EG is also hard wired to the filters and will still have an effect when switched off. (i.e. not effecting the amplitude of the synth output but still effecting the filter)

Filter-A behaves as a 2x2 pole low-pass series design when in LOW mode producing a 4 pole 24db filter, when switched to High Mode the second stage of the filter changes to a 2 pole high-pass filter producing a high/band-pass effect.

Filter-B is a 4 pole low-pass design and is placed after Filter-A in series, Filter-B behaves differently to Filter-A producing a different tone, in addition to this the resonance can be switched to boost mode producing self-oscillation.

Filters A and B can both be active at the same time producing an additional 8-pole 48db filter stage.


LowFlo Duo is a Multi-Wave LFO for adding modulation to the operators, it also has an effect on the cutoff of Shaper Six and the modulation of Phazed Extract, both LFO's work identical and can interact with each other producing complex modulation wave-forms.

When EG is activated the LFO passes through the DELAY and HOLD dials when each gate pulse is received.

TRG re-starts the LFO waveform with each gate pulse.

In FM mode each LFO will frequency modulate each other altering the LFO rate.

X-MOD will pitch modulate the LFO's.

The SYM dial (symmetry) alters the shape of the waveform shifting the waveform forward allowing the LFO to start with a positive or negative motion.


The PROGRESSION SEQUENCER is used to add changes to the pitch of the operators and the cutoff of the filters, this is an analog style sequencer and will automatically alter its step position as you change the dials, it works in mono and poly modes.

Each of the steps can be altered from 1 to 64 beats, giving you a maximin of 512 beats over the eight steps, the number of steps can be set from 2 to 8 and can be adjusted from whole note to a maximum of sixty fourths.
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FBxi is a patchable Multi-FX processor.


The 8 stereo filters are made up from 32 single pole high pass and low pass filters, the filters are combined to produce 16 band pass filters, the band pass filters are equally spaced from low to high spanning eight octaves, the position that each filter sits in the spectrum is set by the DISPLACE dial, when MODUS is on the filters will move up and down the spectrum and across the stereo field.

MODUS (Modulation Bus)

MODUS modifies the modulation LFO that alters the placement of the FILTER BANK via the DISPLACE dial.

It also has an effect on the FLANGER and the PHASER sections of BOUNCE.


The BOUNCE DELAY receives its signal from the MODUS FILTER BANK.

The flanger section of the delay can be influenced from MODUS ACTIVITY.

The PHASER is a stereo vintage analog design with a twist, the LFO of the phaser receives its clock source from the MODUS bus, this has the effect of speeding up and slowing down the phaser producing a wah-wah effect.

The signal is then passed onto the ATMOS SPACE effect if the parallel switch is set to off.

How BOUNCE and ATMOS are connected to each other is determined with the parallel-series switch, when in series the output of Bounce is connected directly to the input of Atmos, and the two effects run in series, when switched to parallel both effects receive their input from the FILTER BANK, both of the effects are then combined before being passed onto the MOVEMENT processor.


The first process is the pre-delay, this allows a small amount of space to be place to the front end of the ROOM, the pre delay is stereo and the left and right delay times can be offset adding a shift to the image.

Next is the 3 BAND EQ, the equalisers are wired in parallel, the first is a 1 pole LOW shelf filter, the second is a 2 pole parametric MID and the third is a 1 pole HIGH shelf filter, each one of the eq's can be set to cut or boost the signal.

The signal then enters the ROOM, this sets the overall size of the space, at the lowest settings and with careful adjustment of the equalisers and filters you can effectively reproduce the body of an instrument, as you move this dial to the right the reflections will become more spaced producing a larger ambience.


MOVEMENT receives its signal from ATMOS and BOUNCE.

This unit has two independent mono LFO modulated panning circuits allowing the left and right signals to be independently positioned in the stereo field with modulation applied.

Audio Demo

About the demo track.

Syzygys Second Exit was recorded in Logic using just SyChrome, each part was then frozen before moving on to the next with a few visits back and forth.

A total of 11 instances of SyChrome was used, no other effects or eq added.

At the mix stage automation was used on each track, the tracks were then passed onto 3 subgroups with compression added, then the whole mix was passed through the WAVES Kramer Tape plug-in and bounced down, no other mastering tools used.
Shortwave SID is a collection of loops produced with SyChrome, recorded direct to HD, nothing added.


Screen Size - 1662 x 1128

Reaktor 5.8.0 upwards


Screen Size - 862 x 538

Reaktor 5.8.0 upwards


Screen Size - 1662 x 898

Reaktor 5.8.0 upwards

SyChrome-FBxi was built using an Intel Core 2 Duo running at 2.8ghz with 4gb of RAM
SyChrome-FBxi CPU - In stand-alone mode with polyphony set to 4.

All processors off - Background cpu = 7%
All 6 operators active - No fx cpu = 29%
Onboard effects + 6 operators cpu = 40%
FBxi all effects on - SyChrome off = cpu - 31%

SyChrome without FBxi in stand-alone mode will clock approximately 3% less.

FBxi without SyChrome in stand-alone mode will clock approximately 10% less.

ET Shop

Reaktor Version 5.8.0 or later required.
3 ensembles included in download:


Download file size 29.32mb
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