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The Calc-U-Synth Black Friday deal puts this Reaktor ensemble from Heavyocity at $15, 48% off, with the offer ending Dec 18, 2026. It is a lo-fi calc u synth built around the Casio VL-Tone, and it needs Reaktor or Reaktor Player to run.
The VL-Tone was a digital calculator and synthesizer hybrid that came out in the summer of 1979 and stayed in production until 1984. The maker calls the original Calc-U-Synth a "band in your hand" emulation of it.
The real VL-Tone runs in one of two modes, calculator or synthesizer. The synth side is monophonic, with 5 preset sounds and a sixth, user-programmable slot called ADSR.
Calc-U-Synth lays out the VL-Tone's programmable features in a roomier interface, and the maker says it keeps the character of the original instrument.
The maker says every aspect of the original was measured and reproduced with care. The VL-Tone's built-in speaker was analyzed and modeled, so the tone carries that small-speaker voice.
The key-click noise of playing the instrument was sampled and included too, for extra lo-fi realism. You can dial that in as much or as little as you like.
The core sound is expanded with several effects and performance tools:
Calc-U-Synth was made with the Reaktor Blocks framework. If you own the full version of Reaktor, you can drop those blocks into your own builds.
On Mac, the minimum is OS X 10.10, 10.11 or macOS 10.12 with the latest update, on an Intel Core 2 Duo. On PC, it is Windows 7, 8 or 10 with the latest Service Pack, 32 or 64-bit, on an Intel Core 2 Duo or AMD Athlon 64 X2.
Adam Hanley founded Icebreaker Audio in 2011, using it to release small-batch product ideas and passion projects. Adam's name is in the credits of many Kontakt and Reaktor products, and he handles the Kontakt scripting at Heavyocity.
Calc-U-Synth is the result of long-term research into lo-fi sound generation and old digital hardware, together with the designer's fondness for the charm of the VL-Tone.
Yes. The Calc-U-Synth Black Friday deal takes 48% off, bringing the Reaktor ensemble to $15. The offer ends Dec 18, 2026. It is a direct download, so there is no physical copy to wait for.
You need Reaktor or Reaktor Player, version 6.2 or later, since the ensemble is powered by the Reaktor engine. Minimum systems are macOS 10.12 or Windows 7 on an Intel Core 2 Duo, or an AMD Athlon 64 X2 on PC.
The ensemble ships with 74 snapshots and 9 Reaktor Blocks for Reaktor Full users. It takes up 19.5 MB on disk and is available as a direct download only. Effects include an arpeggiator, glitch controls and a filter and delay module.
It follows the Casio VL-Tone, whose synthesizer is monophonic. That instrument has 5 preset sounds and a sixth, user-programmable ADSR slot. Calc-U-Synth lays those programmable features out in a more convenient interface while keeping the character of the original.
Prices and end dates are checked at publishing time and can change, so confirm them at the store before you buy.