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Rhythmic Robot

Rhythmic Robot release Lambda for Kontakt - a sampled recreation of the Korg Lambda ES50 analogue polysynth

Rhythmic Robot have released Lambda, a sampled recreation of the Korg Lambda ES50 polysynth.

The original Lambda, produced in 1979, was a preset-based synthesiser with genuine polyphony, two banks of preset tabs, and some unusual (and musically useful) touches like two filter circuits, one dedicated to the Brass patch; a separate key-click control for the Electric Piano patch; a global filter; and, unusually for its time, a stereo "chorus-phase" effect which output on twin jacks. This stereo effect, plus detunable oscillators in the synth section, gave the Lambda a typically rich, thick analogue sound and made it a coveted classic.

The Rhythmic Robot version builds on the capabilities of the original but allows the user to switch in a "vintage" mode, restricting the software to the hardware's behaviour, for creating authentic patches. The more modern updates to the original include resonance on the global filter circuit, a full ADSR amp envelope, a dedicated AR envelope for the percussive sounds, a battery of additional vintage-style effects, velocity sensitivity and individual level trims for the preset patches – allowing combinations of sound impossible on the original.

Lambda involves over 730 samples taken from a pristine-condition original machine, totalling 2.4GB (compressed) at 24-bit. It includes separate samples for the stereo Chorus effect and the detunable oscillators. The resulting software instrument can sound identical to a 1979 original, or be used to create entirely new patches which have the same tonal signature as the vintage unit. Lambda excels at pads, strings, vintage-sounding EPs and synth brass sounds.


  • Over 730 24-bit samples totalling 2.4GB (compressed).
  • "Vintage" mode for total authenticity, or switch it off and create patches impossible on the original.
  • Individual control over instrument levels allows sound-blending for rich, luxurious sounds.
  • Stereo Chorus-Phase effect sampled from the original machine: lush, swirling and complex.
  • A selection of vintage-style effects including Phaser, Leslie speaker, Amp Cab simulator and Reverb.

Lambda is available now from Rhythmic Robot at an introductory price of £29.95 (the normal RRP is £34.95). Audio demos, more information and images are all up on the website.

It requires Kontakt version 4.2.3 or later to run (including all versions of Kontakt 5). Kontakt Player is not supported.

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