FAC Polyflo is a new iOS/macOS app and AUv3 plugin that modulates and sequences MIDI and CV hardware with LFOs, and more.
Modulation is a tool that brings movement and life into your sound. This is done with LFOs, envelopes, and other modulators. They are essential in synths, especially in modular synths. But many DAWs also have these already built in, like Ableton Live, Bitwig Studio, and others.
If not, it’s possible to bring modulation into any MIDI- or CV-capable device. One option would be a DC-coupled audio interface and a 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 as a AUv3 FX and AUv3 MIDI plugin. FAC Polyflo is like a complex modulation Eurorack module but in software.
It can be used in three different ways. First as a modulator for MIDI hardware (synths, drum machines…) using a MIDI interface. With CV hardware (analog synths, Eurorack) with a DC-coupled audio interface like Expert Sleepers ES-9.
Third option you can use it in your existing software enviroment and modulate parameters of plugins with MIDI. The latter is probably the most straightforward way to use it.
Polyflo features two LFO generators with 12 different waveforms, including classic shapes and random spline, with support for cross-modulation and syncing. Then, it includes an envelope follower that tracks audio FX input or an external sidechain.
The generated signals, together with the host clock and MIDI input, are fed into six independent FLO(W) processors. These are unique processors combine, shape and route inputs using math operations, conditional logic, and comparators.
Each FLO processor supports up to 18 inputs with individual control over the 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, enabling easy integration with hardware via DC-coupled audio interfaces. Additionally, you can route it also to a stereo output for simpler setups.
It outputs MIDI and analog CV simultaneously, making it well-suited for hybrid setups that combine digital and analog equipment.
FAC Polyflo can also convert MIDI notes, pitch, and control changes into control voltages, making it a powerful MIDI-to-CV solution.
First Impression
Polyflo isn’t the first iOS app to act as a MIDI and CV modulator for hardware and software. However, it’s the most comprehensive and deepest to date.
If you have a DC Coupled audio interface and want to access new modulation sources at a reasonable price, you have come to the right place
FAC Polyflo is available now for an introductory price of $6,99 instead of $9,99 until October 21, 2025. It’s a universal purchase and runs as a standalone app and AUv3 FX/MIDI plugin on iPhones, iPads, macOS, and Apple Vision.
More information here: Fred Anton Corvest / App Store
“FAC Polyflo is available now for an introductory price of $6,99 instead of $6,99 until October 21, 2025.”
Wow. Quite a discount!
Sounds like it was briefly available for 5USD…
https://appraven.net/app/204373877
ups, it should be 9,99
I got this thinking, yes, use it with my modular. But I am having real difficulties using it on my Mac. I have a 10 in and 16 out Expert Sleepers direct coupled interface. I can only output to 1 and 2 as in stereo. All the other ins and outs are inaccessible. I tried the standalone version and the plugin with Logic Pro. I had to have the ES interface selected via Systems Preferences. The UI of the plugin has what appears to be four outputs but only 1 and 2 work. I contacted the developer and he said that the standalone app only exists to install some components for the plugin to work. He said that you have to use some combination of Aux channels to get multiple outputs. I told him that are plugins with multiple outputs and that Logic supports these. He replied that he didn’t see that anywhere. He says it works with Ableton Live. The idea behind this plugin is great, but the implementation needs to be better thought out. Maybe it’s just me, but this looks like it needs more work.