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 sg-grainbot by Synthgeek is a Virtual Instrument and a Virtual Effect Audio Plugin. It functions as a VST Plugin.
Product sg-grainbot
Developer Synthgeek
Price (MSRP)
Type / Tags Synth (Granular)FSUGranulatorSynth (Noise)
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
Supported Sample Formats (loads or saves) include
Miscellaneous Information
Copy ProtectionNone

Grainbot is an experimental synth based on granular synthesis and mathematically generated noise. It's not made for traditional bass/lead/pad type stuff (though it can do that if pressed), but it is capable of a wide range of other sounds: mechanical and engine-type sounds, rhythmic percussion sequences, random bleepery, drones, ambiences, and more. It can also process external audio.

There are two sound sources: the grain generator (which can granulate internal sound sources or an audio input), and "gen 1", a chaotic math-based sound generator. There is also a ring modulator which uses these two generators as its inputs. You can choose between 5 different input sources for the grain generator: live audio input, a built-in analog-style oscillator, the input amplitude modulated by the oscillator, gen 1, or audio input from a file. The sound generators are processed through a filter with 5 types (lo pass, hi pass, notch, and 2 flavors of band pass) and a selectable number of stages. There is also a stereo delay effect which can sync to host tempo (or not). Various parameters (including the delay effect) can be modulated with 2 step sequencers, 3 LFOs, and a 6-stage envelope. The modulation routing is provided via matrix. Besides the modulators mentioned above, there are also matrix inputs for key tracking and velocity, and a "combiner" which uses various math formulas to combine any two mod sources in various ways.

Originally released for the 2009 KVR Developer Challenge, since updated.


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