Tone Projects releases Unisum mastering compressor

Mastering legend Bob Katz has dubbed it the most analogue-sounding digital compressor to date.

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Tone Projects Unisum SS

Image: Tone Projects

Tone Projects has released Unisum, a mastering compressor that aims to equip engineers with a precise set of tools for tackling mastering challenges of all shapes and sizes.

Unlike modern mastering compressors that offer AI-driven toolsets, or a one-size-fits-all solution, the company has said that Unisum is designed to embrace “the complexity of modern mixing and mastering”. To this end, it gives engineers a clean wide-band compressor that relies on a multi-band detection path.

The highly controllable multi-band detection path sits at the centre of Unisum’s design. The sidechain is split into three frequency bands that each have their own parallel RMS and Peak detectors. It is also possible to set up frequency-dependent threshold, ratio and attack/release setting.

Unisum is designed to be highly tweakable, allowing engineers to add “glue or groove” to their masters. It also allows users to shape dynamic contours, or improve particularly troublesome mixes with accuracy.

The additional “HYGGE” circuit can be engaged to introduce transformer and tube warmth to your output signal, emulating the sonic characteristics of analogue studio equipment.

On the company’s website, acclaimed mastering engineer and Unisum beta tester Bob Katz described the plug-in as the most analogue-sounding of all the digital compressors he uses.

Learn more about Unisum at

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