2HP Tune (2010–Present)

Name: 2hp Tune
Brand: 2hp

A tiny quantizer that turns chaotic voltage into music with just a twist—like magic, but smaller than a matchbox.

Overview

You’re knee-deep in a patch, cables snaking everywhere, CV wobbling unpredictably from an LFO modulating a noise source through a slew limiter—and suddenly, nothing sounds like music. That’s where the 2HP Tune slips in, silent and silver, like a monk who only speaks in perfect fifths. It doesn’t make sound, doesn’t oscillate or filter or delay. Instead, it listens, interprets, and corrects. Feed it any incoming pitch CV—wobbly, random, or just plain out of key—and it locks that signal to one of 11 built-in musical scales, from chromatic to whole tone to octatonic, so your modular jams don’t spiral into atonal chaos. It’s not flashy, but in a Eurorack system, it’s as essential as a tuning fork in a rehearsal room.

What makes the Tune remarkable isn’t just what it does, but how little space it demands. At exactly 2HP wide—yes, two horizontal pitch units, the narrowest standard module size—it’s a masterclass in minimalist design. You could fit three of them in the width of a standard laptop charger. Yet within that sliver lives a full-featured quantizer with a tactile knob and a single-button scale selector. No menus, no OLED screens, no firmware updates. Just voltage in, corrected voltage out. The front panel is nearly bare: a knob labeled “Bias,” a push-button switch to scroll through scales, and a single LED that blinks when it’s quantizing. It’s the anti-bloatware of modular synthesis.

And then there’s the Bias control—the secret weapon. Most quantizers just snap your CV to the nearest note in a scale. The Tune lets you *shift* the entire scale up or down in semitone steps, transposing your melody on the fly without touching your sequencer. Want to pivot from C major to D Dorian mid-phrase? Twist the knob. Feeling modal? Bias lets you explore every mode of a given scale without reprogramming a single step. It’s performative, expressive, and oddly musical for a module that doesn’t make sound. In a live set, that knob becomes a kind of magic wand, transforming melodies in real time like a jazz musician reharmonizing a chord progression.

Still, the Tune isn’t for everyone. It has no MIDI input, no user-defined scales, no microtonal tuning tables. If you’re deep into alternate tunings or want to recreate Balinese gamelan scales, this isn’t your tool. It’s built for immediacy, not flexibility. And while its 11 preset scales cover most Western harmonic ground—major, minor, pentatonic, blues, whole tone, diminished, and octatonic—it won’t satisfy the microtonal explorer. But for 90% of Eurorack users who just want their random voltage bursts to sound like actual music, the Tune is the fastest, cleanest path from noise to melody.

Specifications

Manufacturer	2HP
Production Years	2010–Present
Original Price	$109
Type	Synth Module
Power Supply	Eurorack ±12V
Max Power Consumption	40 mA (+12V), 3 mA (-12V)
Depth	45mm
Width	2HP
Inputs	1 x CV Input (Pitch)
Outputs	1 x Quantized CV Output
Controls	Bias Knob, Scale Select Button
Indicators	1 x LED (Quantize Activity)
Scales	11 Preset Scales (Chromatic, Major, Minor, Pentatonic, Whole Tone, Octatonic, etc.)
Color	Silver or Black Panel
MIDI	No
Effects	None
Keyboard Size	N/A
Weight	Approx. 50g

Key Features

The Bias Knob: Modal Magic in Real Time

The Bias control is what elevates the Tune from utility to instrument. Most quantizers are static—they map incoming CV to a fixed scale. The Tune lets you *move* that scale. Turn the knob, and the entire quantization grid shifts up or down in semitone increments. This means you can start in C major, then bias up two semitones to hear the same sequence in E Phrygian, or up seven to land in G Lydian. It’s not just transposition; it’s modal exploration on the fly. In a performance, this turns a simple sequencer pattern into a shifting harmonic landscape. The knob has a smooth, precise feel—no jitter, no stepping—so you can make subtle or dramatic changes with confidence. It’s rare for a single control to redefine how you interact with a module, but the Bias knob does exactly that.

Scale Selection: Less Choice, More Focus

With only 11 preset scales and no user-programmable options, the Tune forces you to work within constraints—and that’s its strength. Instead of drowning in scale libraries or MIDI dumps, you’re given a curated set of musically useful options. There’s chromatic (for when you want no quantization at all), major and minor (the backbone of tonal music), pentatonic (for blues and rock), whole tone (for dreamy, ambiguous harmonies), and octatonic (for jazz and tension). The absence of customization isn’t a flaw; it’s a design philosophy. The Tune assumes you want to make music, not spend 20 minutes programming a scale. The single push-button cycles through scales in a fixed order, with the LED flashing to indicate selection. It’s not the fastest way to jump to a specific scale, but it encourages experimentation—what happens if I try this melody in diminished instead of Dorian? That kind of happy accident is where modular synthesis thrives.

Minimalism as a Virtue

At 2HP wide and 45mm deep, the Tune is a triumph of compact engineering. It draws minimal current (40mA on +12V, just 3mA on -12V), so it won’t tax your power supply even in densely packed cases. The build quality is solid—aluminum panel, precision potentiometer, no wobble or flex. It doesn’t look like much, but that’s the point. In a format where modules often compete for attention with flashing lights and colorful graphics, the Tune is the quiet one in the corner who actually knows the chords to every song. It’s also available in both silver and black panel versions, so it can blend into any build aesthetic. For travelers or case minimalist, this is the quantizer that doesn’t steal space from oscillators or filters. You don’t miss what you never knew you needed—until you patch it in and suddenly everything sounds *right*.

Historical Context

When the 2HP Tune launched around 2010, Eurorack was still a niche within a niche. Doepfer’s A-100 system had been around since the ’90s, but modular was far from mainstream. Most quantizers were wide, complex modules—think Intellijel’s Quadrax or Make Noise’s Pressure Points—offering deep functionality at the cost of precious panel space. The Tune arrived as a counterpoint: a single-purpose module that did one thing exceptionally well in the smallest footprint possible. It reflected a growing trend in Eurorack toward utility modules—small, focused tools that solved specific problems without bloat.

At the time, 2HP (founded by Tony Rolando, formerly of Doepfer USA) had already built a reputation for minimalist, high-quality designs. The Tune wasn’t their first module, but it became one of their most iconic—partly because it addressed a universal need. As modular users began patching more generative, chaotic systems (random sequencers, chaotic oscillators, sample-and-hold circuits), the need for a compact quantizer grew. The Tune filled that gap perfectly. It wasn’t the first quantizer, but it was the first to make quantization *accessible*—both in price and physical size. Competitors like Intellijel and Mutable Instruments eventually released their own compact quantizers, but the Tune remained a benchmark for simplicity and elegance.

It also arrived just before the Eurorack boom of the 2010s, when boutique manufacturers flooded the market with feature-heavy, screen-laden modules. The Tune stood in quiet opposition to that trend—a reminder that sometimes, less is more. It didn’t need USB, MIDI, or firmware updates. It didn’t even have a display. It just worked, reliably, for over a decade. In an era of planned obsolescence and software dependence, the Tune became a symbol of analog resilience.

Collectibility & Value

The 2HP Tune isn’t a rare module—production has been steady since 2010—but it’s also not one you’ll find cheaply used. New units still sell for $109 direct from 2HP, and the used market reflects that. Expect to pay $80–$100 in good condition, depending on color and seller. Silver panels are slightly more common, but black panels—especially early runs—can fetch a small premium among collectors who value aesthetic cohesion in their cases. Unlike some boutique modules, the Tune doesn’t suffer from major failure points. There are no moving parts beyond the knob and button, and the circuit is simple enough that repairs are straightforward. Service technicians observe that the most common issue is bent pins on the power connector, usually from careless insertion into a crowded bus board. Otherwise, the module is nearly bulletproof.

That said, there are a few things to check before buying used. First, test the Bias knob for smooth operation—no jumps or dead zones. Second, verify that the scale selector cycles through all 11 scales and that the LED blinks with each change. Some users report occasional firmware glitches in very early units (pre-2012), where the module might skip a scale or lock up, but a simple power cycle usually resolves it. A full reset—holding the button while powering up—can reinitialize the scale counter if needed. There are no known capacitor aging issues or corrosion problems, thanks to the low power draw and minimal internal components.

For new users, the Tune remains a smart buy. It’s not flashy, but it’s one of those modules you didn’t know you needed until you patch it in and suddenly your random voltage sequences sound like melodies. For experienced builders, it’s a space-saving essential—perfect for filling that awkward 2HP gap next to a power connector. And for minimalists, it’s a philosophy in module form: do one thing, do it well, take up as little space as possible. It won’t appreciate like a vintage Roland, but it also won’t disappoint.