2hp MIDI (2013–2024)

Name: 2hp MIDI
Brand: 2hp

A tiny translator that speaks fluent MIDI and Eurorack, turning your laptop into a synth command center without the cable spaghetti.

Overview

It’s the quiet ones you have to watch—especially when they’re only two horizontal pitch units wide. Slide the 2hp MIDI into your rack, plug in a USB mini cable, and suddenly your modular system isn’t just analog nostalgia; it’s talking to your DAW, your MIDI keyboard, or that old Roland groovebox like they’ve known each other for years. No firmware updates, no menu diving, no drivers—just a blinking red LED that pulses with life as MIDI data streams in. That simplicity is its superpower. You don’t set up the 2hp MIDI; you plug it in and it works, which in the often-fragile world of USB-MIDI-CV translation, is nothing short of miraculous.

But don’t mistake its plug-and-play ease for limited functionality. Behind that minimalist silver or black faceplate is a smart little brain that parses MIDI into four distinct operating modes: monophonic (one CV/gate pair tracking your lead lines), duophonic (two-note polyphony with dedicated CV outs), dual mono (two independent monophonic channels—perfect for layering), and quad trigger (four independent gate pulses from a single MIDI channel, ideal for drum sequencing). Each mode reshapes how your modular system interprets incoming data, and switching between them is as simple as holding a button during power-up. It’s rare to find a module that’s both this accessible and this flexible, especially in the early 2010s Eurorack boom when many MIDI interfaces demanded complex configuration or external hosts.

What really sets the 2hp MIDI apart isn’t just what it does—it’s how unobtrusively it does it. At only 2hp wide, it’s skiff-friendly, power-sipping, and mechanically simple. There are no moving parts, no patchable configuration inputs, no endless parameter screens. It draws a negligible 27 mA from the +12V rail and nothing from the 5V line, making it one of the most efficient MIDI-to-CV converters ever made. And because it’s class-compliant, it shows up as a standard MIDI device on Mac, Windows, and Linux—no special drivers needed. That reliability made it a staple in desktop setups, travel rigs, and starter systems where space and stability were at a premium.

Still, its strengths come with trade-offs. The 12-bit resolution on the CV outputs is adequate but not stellar by modern standards—fine for pitch, but less ideal for smooth filter sweeps or nuanced modulation. And while the quad trigger mode is clever, it doesn’t offer per-step velocity or aftertouch routing, limiting its expressiveness for advanced performers. It also lacks internal quantization, so if your MIDI source plays slightly sharp or flat, your VCOs will follow obediently off-key. But for what it’s designed to do—bridge the gap between digital control and analog synthesis with zero fuss—it remains one of the most trusted translators in the Eurorack ecosystem.

Specifications

Manufacturer	2hp
Production Years	2013–2024
Original Price	$109
Width	2hp
Depth	45mm
Power Consumption (+12V)	27 mA
Power Consumption (-12V)	3 mA
Power Consumption (5V)	0 mA
CV Outputs	2 (12-bit resolution)
Gate Outputs	2
MIDI Input	USB Mini-B
MIDI Output	None (MIDI-to-CV only)
Operating Modes	Monophonic, Duophonic, Dual Mono, Quad Trigger
MIDI Message Support	Note On/Off, MIDI Clock, Control Change (CC)
Class Compliant	Yes (Mac, PC, Linux)
Status Indicator	LED for MIDI activity
Weight	Not specified
Manual	Available at twohp.com

Key Features

Four Modes, One Purpose

The 2hp MIDI’s real intelligence lies in its four operating modes, each unlocking a different way to control your modular system. In monophonic mode, it behaves like a classic analog synth, tracking a single pitch with CV and gate—ideal for leads and basslines. Switch to duophonic, and it splits incoming MIDI notes across two CV outputs, letting you play two oscillators in harmony or stack two different voices. Dual mono mode turns it into two independent monophonic converters, perfect for driving separate synth chains from a MIDI keyboard’s split zones. And quad trigger mode? That’s where it gets clever: a single MIDI channel can trigger four separate gate outputs, making it a no-brainer for driving drum modules like the 2hp Drums or Doepfer A-174-2. No other module in this size class offered that level of mode flexibility without requiring external logic or firmware tweaks.

USB Mini-B: Blessing and Limitation

The use of a USB Mini-B connector—now nearly obsolete—was both forward-thinking and slightly inconvenient at launch. In 2013, most MIDI interfaces still relied on bulky 5-pin DIN connectors, requiring additional USB-to-MIDI adapters to link with computers. The 2hp MIDI cut through that clutter by going straight to USB, but it created a new bottleneck: if you wanted to connect it to traditional MIDI gear like a Juno-60 or a TR-8, you needed a USB host (like a computer or a dedicated USB-MIDI hub) in the signal chain. That made it less useful as a standalone hardware bridge. Owners of standalone MIDI gear quickly learned that the 2hp MIDI was optimized for computer integration, not vintage synth patching—unless you were willing to carry a Raspberry Pi in your gig bag.

Class-Compliant Simplicity

In an era when many USB audio and MIDI devices required proprietary drivers or firmware updates, the 2hp MIDI’s class-compliant design was a quiet revolution. It appears as a standard MIDI device the moment you plug it in—no installation, no troubleshooting, no kernel panics on macOS. That reliability made it a favorite in live setups where gear failure isn’t an option. Service technicians note that firmware issues are nearly nonexistent, and the lack of user-updatable code means there’s almost nothing to go wrong. It’s the kind of module you install once and forget about, which in a modular system full of temperamental oscillators and drifting filters, is a rare and valuable trait.

Historical Context

When the 2hp MIDI launched in 2013, Eurorack was exploding beyond boutique studios and into home setups, laptop-based producers, and hybrid rigs. But integrating modular with digital workflows was still a pain—most MIDI-to-CV solutions were either bulky, expensive, or required deep technical knowledge. The 2hp MIDI arrived as part of a wave of “utility minimalism” from designers like 2hp, Intellijel, and Mutable Instruments, who believed that small, focused modules could solve big problems. It wasn’t the first USB-to-CV converter, but it was among the first to combine tiny size, low power draw, and rock-solid reliability in a single package.

Its main competitors at the time—like the Kenton Pro Solo or the Doepfer MSY2—offered more CV outputs or DIN MIDI support but were larger, more power-hungry, and often required configuration via DIP switches or software. The 2hp MIDI sidestepped all that with a “just works” philosophy that resonated with beginners and veterans alike. It also arrived just as DAW-based MIDI sequencing became the norm, making it a natural fit for producers who wanted to extend their digital arrangements into the analog domain without re-sequencing everything in hardware.

The module’s design reflects 2hp’s broader philosophy: minimalism with purpose. Founded by engineer Tony Rolando (also known for his work on the Korg Monotron), 2hp built a reputation for elegant, no-nonsense modules that solved specific problems without overengineering. The MIDI module is a perfect example—no flashy displays, no patchable modes, no hidden menus. It does one thing and does it well, embodying the “less but better” ethos that defined much of the 2010s Eurorack renaissance.

Collectibility & Value

As of 2024, the 2hp MIDI is officially discontinued, marking the end of a decade-long production run. While not a rare module, its status as a reliable, compact USB-MIDI gateway has solidified its place as a modern classic. On the used market, prices reflect its utility and condition: expect to pay $60–$80 for a working unit in good cosmetic shape, with silver-face models sometimes commanding a slight premium over black. Units with damaged USB ports or non-functional LEDs—often from repeated plugging—tend to sell for $40 or less, but repairs are usually straightforward since the circuit is simple and well-documented.

Common failures are few but notable. The USB Mini-B port is the most vulnerable component, prone to wear from frequent insertion and removal. Some users report intermittent connection issues after years of use, often fixable by resoldering the port or replacing it entirely. The status LED, while helpful, has been known to fail on older units, though this doesn’t affect functionality—just the visual feedback. There are no known issues with the CV or gate outputs degrading over time, and the lack of internal battery or memory means there’s no data loss or firmware corruption to worry about.

For buyers, the key check is the USB port’s physical stability and the LED’s responsiveness. Plug it in and send MIDI—any note should trigger the LED to blink. If it doesn’t, the issue is likely the USB interface chip or port. Also verify that the module powers correctly from the Eurorack bus; while it draws minimal current, a faulty power connector can cause erratic behavior. Given its simplicity, most problems are mechanical rather than electronic, making it one of the more repairable and resilient MIDI interfaces in the Eurorack world.

Despite its discontinuation, the 2hp MIDI remains a practical choice for anyone building a compact or computer-integrated system. It won’t replace more advanced converters like the Expert Sleepers FH-2 or the Intellijel uMidi, which offer higher CV resolution, more outputs, and deeper MIDI mapping. But for straightforward, space-saving MIDI integration, it’s still one of the most cost-effective and dependable options available—even years after production ended.