PolyFreq Phonon: a polyphonic granular Synthesizer plugin with deep modulation

PolyFreq Phonon is a new polyphonic granular Synthesizer with a powerful audio-rate/grain-rate modulation engine and built-in FX.

Granular synthesizers were once again one of the dominant themes at Superbooth 2026, especially in the hardware sector. Don’t miss my Synth News episode about the new granular instruments. 

During Superbooth, the new software developer PolyFreq also released a new granular synth plugin. Given the sheer volume of SB news this year, I’m covering this now for you.

PolyFreq Phonon

Phonon is a new 8-voice polyphonic Synthesizer for macOS and Windows. As a sound source, PolyFreq Phonon uses samples that are easy to import via drag-and-drop.

The sound engine automatically tunes the samples to the right pitch. Alternatively, you can manually tune it to the sample’s root note. Granular synthesis is applied to this material.

According to the developer, it’s a high-quality, precise grain engine that offers up to 256 grains per voice. All control elements are bundled in a grain oscillator module, which makes the entire granulation process very clear.

On the granular menu are classic controls, including playback rate, offset, pitch, grain length, stereo pan, density, jitter, or the shape. The latter allows you to morph between gentle curves and sharp, rectangular window, giving you graintable synthesis.

Additionally, you have various parameters (offset, pitch, length, pan) that are mapped to randomization for very organic granular results. Just a small twist of the knob is all it takes to infuse randomized movement into it.

Another interesting is the ability to cross-fade between the granular and classic sample playback, opening the door for unique hybrid patches. There is also a precise, sub-sample grain scheduling function, four keyboard follow modes, legato, and more.

Modulation & Colorful Shaping

The internal drag-and-drop modulation engine is another highlight of the new PolyFreq Phonon.

9 modulator types and 12 modulator slots are available. They run at audio-rate/grain rate and includes: envelopes, LFOs, spline curves, noise types, step sequencer, sample & hold, XY pad, macros, metadata modulation, MIDI control and more .

Metadata modulation is unusual as it allows you to use the sample RMS as a modulation source, enabling envelope follower effects and more. Nine not enough? The developer even want to expand them if you have other propositions.

Good, you can use as many the same modulators as you want. So, you could use 12 envelopes or 12 LFOs at the same time. Plus, you have individual send levels and inversion option per destination.

Part of the Phonon Synthesizer is also a versatile multi-FX section with saturation, multimode filter, reverb, and a limiter. There are also useful meters that show true peak, program level and reduction amounts.

Sounds can be saved into presets that also includes the samples. Not to forget, there is also a snap shot system with eight slots per presets with undo and redo. Here, you can switch instantly between preset variations, giving you basically 8 presets in a single preset.

First Impression

PolyFreq is a nice new granular Synthesizer. It certainly won’t revolutionize the granular synth plugin scene. It looks very classic to me. What I really like, however, is the plugin’s clear layout and its deep modulation engine.

According to the developer, the plugin isn’t yet completely finished in terms of functionality, and we can look forward to new features.

PolyFreq Phonon is now available at an introductory price of 50,92€ (33% OFF). It runs as a standalone and VST3 plugin on macOS (native Apple Silicon + Intel) and Intel. No AU or AAX at the moment.

More information here: PolyFreq

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