RGB4 … Come and get it..

I was in a quandary here, I have had RGB4 waiting in the wings for quite some while, but it appears to have confounded most of the guys that have volunteered to write patches for it, with a couple of exceptions..Thank you Heiko!

I couldn’t keep holding back and for one reason or another I wasn’t able to spend my own time patching it so I thought I would try something a little different. I haven’t put it up on the Free Synths page as I consider it in beta, but you can download RGB4 HERE. At the moment it only contains 22 of the 64 patch slots filled, but hopefully some of you out there might be able to add to that number.


It has a very unconventional architecture, and I will probably need to do a manual or video tutorial so that you can best understand it but let me have a quick stab at breaking it down.

It consists of two main sound sources: a 32 partial additive Osc and a more conventional  multi-wave VA Osc.

The individual levels of each partial can be controlled by the red sliders at the top left of the display, or by the ADSR sliders ranked below each partial. Obviously if the Red sliders are all the way down then ADSR sliders come into play but only if the blue sliders are above zero, these blue sliders vary the amount of ADSR modulation.

The Green Oscilloscope trace shows the realtime modulation of the waveform.

Below the Additive partial controls is the Multiwave Oscillator, this should be familiar as the Oscillator from the S3 series and has a few simple controls and a mix knob to vary the amount it comes into the sound.

The multiwave waveform is indicated by the Yellow Osscilascope display.

On the right hand side of the interface are a global ADSR which affect the overal amplitude of the sound, below these are Octave Velocity and Volume amounts, below these are controls for bend range, and controls for vibrato, delay rate and amount.


The next section below this is the filter modulation section.

The coloured block with the cross hairs is an x-y pad which is activated by clicking on the background area. If it is on it overrides the middle four filter frequency controls. If it is off the 6 filter frequency controls become active. these are lo-pass 4 band pass and hi pass filters. and it is the use of the 4 band pass filters which help RGB4 to achieve some of the more vocally patches that are included. the resonance controls are below this and then an envelope modulation slider for each filter. Below this are contols for the LFO waveform and amount.

The global control for filter LFO rate is beside the x-y pad and very slow settings with the random LFO waveform result in an interesting effect! The grey/red slider to the left of the rate knob shifts the phase of the LFO waveforms so that a more varied sound can be achieved.

As I say a very quick run through of the RGB4 controls and it will be interesting to see what you clever people make of it. If it is at all successful I will release the plug-in properly.


2 Responses to “RGB4 … Come and get it..”

  1. […] Krakli Synths has released RGB4, a freeware software synth for Windows. […]

  2. Thank you for making this available for free. I am downloading it now.

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