MPE has spent most of its life in the world of software synths and digital keybeds, but one of the more interesting developments in 2026 is how consistently the protocol keeps finding its way into modular hardware. The latest example is Polyend's Poly 2, a MIDI-to-CV converter built for Eurorack systems that treats MPE compatibility as a core feature rather than an afterthought.

What the Poly 2 Actually Does

At its core, the Poly 2 is a bridge: it takes MIDI data from a computer, phone, or standalone MPE controller and translates it into the control voltages and gates that modular synthesizers understand. What makes it notable for expressive players specifically is that it does this polyphonically and with full MPE support, meaning per-note pitch bend, pressure, and timbre data arriving from an MPE controller can be routed to separate voices in a modular patch rather than collapsed into a single, shared control signal.

The module ships with:

8 voices of polyphony, distributed across four Gate outputs, four Pitch outputs, and twelve additional CV outputs that can carry CC data (0–127) for whatever expressive or modulation parameter a patch calls for.

Onboard scale quantization, so incoming MPE pitch data can be constrained to a chosen scale before hitting the CV output — useful for players who want expressive pitch bend but still want notes to land in tune with the rest of a modular patch.

A bright OLED display for configuring outputs, saving presets, and switching between play modes, plus 20 analog patch points that give the Poly 2 a fair amount of routing flexibility for a 14HP module.

Two USB ports, one for a direct computer or phone connection and a second USB Host port that connects straight to an external MIDI controller — including a 5V power option for controllers that need it, removing the need for a separate USB hub in a live rig.

Smart Thru chaining, which lets multiple Poly 2 units be daisy-chained together to expand the total voice count beyond eight — a meaningful feature for anyone building a larger polyphonic modular voice bank around MPE input.

Why This Matters Beyond Modular Circles

Eurorack has historically been a difficult environment for expressive, per-note control. Traditional MIDI-to-CV conversion tends to flatten incoming note data into a single pitch and gate pair, which works fine for monophonic lines but throws away exactly the kind of per-note nuance MPE controllers like the ROLI Seaboard or Expressive E Osmose are designed to capture. A module built to preserve that data end to end — from controller to patch cable — closes a real gap for musicians who want to play an MPE controller into a modular rig without losing the pressure and timbre information that made the performance interesting in the first place.

It also reflects a broader pattern worth watching: MPE support showing up as a checkbox feature on hardware that has nothing to do with synthesis, MPE controller design, or MPE editing itself. A MIDI-to-CV converter is about as far from a screen-based DAW instrument as you can get, and its inclusion of full MPE compatibility says something about how far the protocol has spread as an expected baseline rather than a specialty niche.

Availability

The Polyend Poly 2 is available now through retailers including Sweetwater, Perfect Circuit, and B&H Photo Video, with pricing starting around $387 depending on retailer. For Eurorack owners who've been waiting for a clean way to bring an MPE controller into a modular performance setup, the Poly 2 is one of the more complete answers on the market right now.