ALM Joranalogue Fold 6 (2017–Present)

A 4HP Eurorack module that folds waveforms with a six-stage diode core. Think of a distortion pedal designed by a mathematician who drank too much coffee.

Overview

Turn the Fold knob past noon and a sine wave stops sounding like a synth and starts sounding like a swarm of angry hornets in a tin can. That's where the Joranalogue Fold 6 wants you to go. It uses a six-stage diode folding core that can be routed in series or parallel, depending on which output you pick. The "Main" output runs the stages in series, stacking fold upon fold into a jagged, harmonically dense spike-fest. The "Alt" output routes them in parallel. That gives a broader, more diffuse saturation that's less aggressive but richer in upper mids. Two distinct sonic personalities come out of a single circuit topology, with no menu diving.

The front panel is minimal: two knobs, a few jacks, no display. It is still not a "set and forget" coloration tool. The Fold and Shape knobs interact, and that's where most of the work gets done. Fold controls the intensity of the folding. Shape adjusts the symmetry of the fold points, so you can skew the waveform into lopsided, rectified chaos or keep it balanced and resonant. Turn Shape all the way left and you get a kind of half-wave rectification with a gritty, asymmetrical bite. Turn it right and the folds bloom symmetrically, producing bell-like tones or glassy FM-adjacent textures. It's not a filter, but it acts like one, sweeping through harmonic content with the Fold knob like a resonant peak dragged up a harmonic ladder.

Then there's the overdrive. The internal voltage-controlled overdrive stage sits just before the folding circuit and can be engaged via CV or manually. It's a gritty analog push that saturates the input signal before it hits the folders, so even a weak oscillator output gets fully devoured. At higher drive settings the input stage starts clipping in a way that feels almost tube-like in its compression, fattening up thin waveforms before they get shredded.

At only 4HP, Fold 6 saves space but doesn't skimp on connectivity. Dual signal inputs allow mixing two oscillators, or layering a sine with a triangle before folding, so you can build complex timbres without patching in a separate mixer. The CV inputs for Fold and Shape are exponential, meaning they respond musically to control voltages. You can modulate the fold intensity with an LFO for rhythmic timbral pulsing, or use an envelope to open up the waveform over time like a reverse filter sweep.

Specifications

Manufacturer	ALM Joranalogue
Production Years	2017–Present
Module Width	4HP
Depth	35mm
Current Consumption	40 mA (+12 V)
Current Consumption	40 mA (-12 V)
Inputs	Signal In 1, Signal In 2, CV Fold, CV Shape
Outputs	Main (Series Fold), Alt (Parallel Fold)
Fold Stages	6-stage diode wavefolder
Folding Topology	Switchable series and parallel via output selection
Overdrive	Voltage-controlled analog overdrive stage
CV Response	Exponential for Fold and Shape

Key Features

Series vs. Parallel Folding Paths

Most wavefolders commit to one folding architecture. Fold 6 gives you two routes out of the same circuit. The Main output uses a traditional series configuration, where each folding stage feeds into the next and compounds the harmonic complexity. This is where the most extreme, FM-like textures live - sharp, resonant, and able to cut through a dense mix. The Alt output routes all six stages in parallel and sums their outputs simultaneously. That makes a broader, more organic saturation, less about harmonic stacking and more about textural thickening. Some users patch both outputs into separate VCA channels and blend them dynamically, using the Fold and Shape knobs to crossfade between timbres in real time.

Voltage-Controlled Overdrive with Analog Grit

The overdrive is a core part of the signal chain. It is a genuine analog overdrive stage that reacts dynamically to input level and drive setting. It changes the character of the incoming waveform before folding, which affects the final output a lot. A sine wave with mild overdrive folds into something warm and bell-like. The same wave slammed with high drive turns square-ish and fuzzed-out before the folders even touch it. The CV control over drive intensity means you can modulate the grit, say with an envelope that adds drive only during the attack phase of a note, for a punchy, evolving timbre.

Compact Size, Maximum Impact

At 4HP, Fold 6 takes up less space than a single VCA, yet it delivers a level of sonic transformation usually reserved for 10HP+ modules. That makes it an easy "always-on" module in cramped systems. The dual inputs, dual outputs, and full CV control also let it work as a standalone processor, a feedback element, or even a chaotic oscillator when driven hard with self-modulation.

Historical Context

Fold 6 launched in 2017, when the Eurorack scene was already deep into the wavefolder arms race. Modules like the Make Noise STO, Intellijel Bifold, and Verbos Wavefolders had established the genre, but most committed to a single folding topology. Joranalogue, known for no-nonsense, circuit-forward designs, saw an opportunity to do more in less space. The Fold 6 wasn't the first wavefolder, but it was among the first to offer both series and parallel routing in a single, compact module, and it did so without sacrificing analog integrity. Many manufacturers were turning to digital waveshaping or FPGA-based processing at the time. Fold 6 doubled down on discrete diode folding, which appealed to purists who wanted raw, voltage-controlled analog destruction.

It arrived alongside a wave of interest in complex oscillator design, where users combined basic oscillators with external processors to get FM-like tones without the complexity of full FM synthesis. Fold 6 fit that approach, especially when paired with clean, stable oscillators like the ALM Make Noise STO or the Intellijel Dixie. It also found favor in feedback patches, where its ability to self-oscillate under high gain made it a source of chaotic, evolving textures. It's not a standalone oscillator, but it blurs the line between processor and sound generator.

Collectibility & Value

Fold 6 has never been rare in the traditional sense. ALM Joranalogue maintains steady production, and the module is widely available from authorized dealers. Its reputation has made it a "must-have" for many wavefolder enthusiasts, and used prices reflect that. In excellent condition, a used Fold 6 typically sells for $180 - $220, while new units retail around $250. Unlike some boutique modules that fluctuate wildly in price, Fold 6 has stayed relatively stable, thanks to consistent availability and a no-frills build with no limited editions or color variants.

It's not a module for beginners. There is no visual feedback - no LEDs, no meters, no waveform display - so you're flying blind unless you monitor through headphones or a scope. Some users report confusion when the Fold knob is at minimum (fully counter-clockwise), expecting silence or a dry signal and instead hearing a slightly colored, subtly folded tone. This is by design. The circuit still imparts character even at "zero" fold, due to the analog path and overdrive stage. Buyers should also know that the module draws equal current from both +12V and -12V rails (40mA each), which can be a concern in smaller power supplies that skimp on negative rail capacity.

Failures are uncommon but not unheard of. Service technicians observe that the most frequent issue is related to power supply noise or ground loops when used in poorly regulated systems, which can introduce hum or instability. The module itself is solidly built with no known weak components, but users report that driving it with excessively hot signals (especially from digital oscillators) can cause unexpected clipping or distortion upstream. A simple attenuator on the input can solve this, but it’s a quirk worth noting. Overall, Fold 6 is a low-maintenance, high-reward module—just don’t expect it to play nice with everything out of the box.