FAC Polyflo is a new iOS/macOS app and AUv3 plugin that modulates and sequences MIDI and CV material with LFOs, and more.
Modulation is a tool that brings movement and life to your sound. This is done with LFOs, envelopes and other modulators. They are essential in synths, especially in modular synths. But many DAWs also integrate them, like Ableton Live, Bitwig Studio and others.
Alternatively, it is possible to introduce modulation into any MIDI or CV compatible device. One option would be a DC-coupled audio interface and software tool like the new FAC Polyflo app for iOS and macOS.
FAC Polyflo
Polyflo is a new modulation plugin for iOS and macOS that works like an AUv3 FX and AUv3 MIDI plugin. FAC Polyflo is similar to a complex Eurorack modulation module but in software form.
It can be used in three different ways. First as a modulator for MIDI equipment (synths, drum machines, etc.) using a MIDI interface. With CV hardware (analog synthesizer, Eurorack) with a DC coupled audio interface like Expert Sleepers ES-9.
Third option, you can use it in your existing software environment and modulate plugin parameters with MIDI. The latter is probably the simplest way to use it.
Polyflo includes two LFO generators with 12 different waveforms, including classic shapes and a random spline, with support for cross modulation and sync. Next, it includes an envelope follower that tracks the FX audio input or an external sidechain.
The generated signals, along with the host clock and MIDI input, are fed into six independent FLO(W) processors. These are unique processors that combine, shape and route inputs using mathematical operations, conditional logic and comparators.
Each FLO processor supports up to 18 inputs with individual control over polarity, division and multiplication, providing deep and flexible modulation.
Remember that this is a plugin, so you can use multiple instances of it. Depending on the size of your DC coupled interface, you can generate a lot of modulation for your Eurorack system.
At the end of the signal chain, each FLO output is connected to its own output bus, allowing easy integration with hardware via DC-coupled audio interfaces. Additionally, you can also route it to a stereo output for simpler setups.
It produces MIDI and analog CVs simultaneously, making it well suited to hybrid setups combining digital and analog equipment.
FAC Polyflo can also convert MIDI notes, pitch and control changes to control voltages, making it a powerful MIDI to CV solution.
First impression
Polyflo is not the first iOS app to act as a MIDI and CV modulator for hardware and software. However, it is the most comprehensive and in-depth to date.
If you own a DC-coupled audio interface and want access to new modulation sources at a reasonable price, you’ve come to the right place.
FAC Polyflo is available now at an introductory price of $6.99 instead of $9.99 until October 21, 2025. It is a universal purchase and works as a standalone app and AUv3 FX/MIDI plugin on iPhone, iPad, macOS and Apple Vision.
More information here: Fred Anton Corvest / App store
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