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Robert Lippok On The Polyend Poly MIDI to CV Converter
Rounik Sethi on Tue, September 5th 0 comments
The Polyend Poly eurorack module MIDI to CV convertor is put to the test by Robert Lippok. He explains just how useful this module is.

The Polyend Poly module is a rather fantastic MIDI to CV convertor that is easy to overlook but could well be an essential missing piece in any modular synthesizer studio.

Recently Robert Lippok demonstrated and explains what makes the Poly special in his eurorack-centered studio with Mutable and Make Noise devices. Here's the video:

Here's more info on the Polyend Poly in case you missed it back in June or from Superbooth.

Poly is a MIDI to CV converter in the Eurorack format, containing a multitude of connectivity options. It has several ingenious features that demand attention, including the ability to seamlessly integrate Android / iOS smartphones and tablets devices directly into a Eurorack rig.

Originally conceived as the quintessential way to integrate Polyend’s impressive SEQ sequencer into the Eurorack ecosystem, the Poly adds a goldmine of unprecedented features, which makes the Poly a standout in the world of one-dimensional MIDI modules. First and foremost, you can connect all your standard MIDI devices via the front-panel MIDI DIN port. This means all your classic keyboards and legacy controllers can be employed into your Eurorack with a standard connection. Next, is a USB B port for connecting a computer, as well as smartphones and tablets. The USB Host connection allows users to connect class compliant MIDI controllers by easily attaching a USB cable to the front panel input.

The 22HP width Poly provides an arsenal of CV analog options, including eight rows of Gate, Pitch, Velocity and Modulation for complete control of Eurorack synthesizers and drum machines. The Poly's flexibility, with its vast array of multiple inputs and outputs, provides the user with the freedom to connect all sorts of sequencers, digital audio workstations (DAWs), keyboards, controllers, apps and more, the only limit is your imagination.

Polyend is a companion for MPE controllers like ROLI Seaboard.

Polyend Poly Technical Specifications


  • USB A (5V)
  • USB B


  • 8 Gate Outputs (0-12V)
  • 8 Pitch Outputs (0-12V, V/oct.)
  • 8 Velocity Outputs (0-12V)
  • 8 Modulation Outputs (0-12V, selectable CC message 0-127 using DIP switch on the back panel)

Smartphone/Tablet Connectivity

  • iOS Devices connect with the Camera Connection Kit
  • Android Devices are Plug & Play


  • Eurorack Width - 22 HP; Depth: 25 mm

Polyend didn't stop there, they furnished the Poly with three distinct operating modes, Channel, First and Next. Channel translates data received from MIDI channels 1-8 and directly into the corresponding CV channels. This mode is what the majority of users will employ to connect DAWs or external sequencers. If you want to utilize MIDI Notes instead of Channels, simply flip the rear dip switch and you're ready for action.

First and Next modes are designed for playing Eurorack synths with an external controller and Polyend makes this work with automatic gate recognition, a sophisticated technology that understands what is connected to the Poly without the need for manual buttons or switches. First mode allows you to trigger one module with your first press of a key on an external controller and while still pressing the first key, you can then trigger a second note from the next connected synth. This scenario works great for triggering a big bass note with the first key press and a lead with the second. Next is Poly's polyphonic mode, which allows you to trigger the same note across all connected synthesizer modules.

Now Polyend could have wiped their hands clean and released the Poly with these impressive attributes, but they decided to push the unit further into the future by making it compatible with the MPE (Multidimensional Polyphonic Expression) standard. "The Poly's MPE implementation means that the user now has a totally new way of communicating with their modular system," exclaims Piotr Raczynski, Polyend's CEO. "Now you can have control over any CV parameter using horizontal and vertical movement and do it polyphonically! The most obvious example is opening the filter with a vertical swipe. But imagine playing chords and then being able to control a drum sequence length with one finger, the kick drum's pitch with another finger, the reverb on a snare with a third finger and a synth's cutoff with a fourth. It opens so many new ways of playing and creating music with modular synths!"

Anyone already familiar with Polyend understands that they just couldn't release a simple MIDI to CV converter for the Eurorack format, they insisted on taking a different approach and make a statement. The Poly compliments their Seq sequencer and mind-blowing Perc Pro with the same manner of innovation, attention to detail and exciting features that has defined the company to date. The Poly is available at store for 399 USD / 449 EUR.

Price: $399 USD

Web: Website:

Stay tuned to AskAudio for a full review of SEQ coming soon.

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