ALM Joranalogue Contour 1 (2019–)

An 8HP Eurorack module that takes the slew limiter and makes it a function generator with a lot of voltage control.

Overview

Plug in the ALM Joranalogue Contour 1 and it looks like a tidy little envelope generator, something to smooth out gates or round off CV spikes. Push the rise and fall sliders past noon, dial in some bend, and it starts doing a lot more. It's a function generator, not just a slew limiter. Seasoned patchers end up with two or three of these. One use is a wobbling LFO with logarithmic descent. Another is freezing a drifting sequence in mid-slope with the Hold input.

The Contour 1 is a modern descendant of the Serge DUSG (Dual Universal Slope Generator), a circuit that has been part of experimental synthesis since the 1970s. The DUSG required complex patching and a good understanding of voltage behavior. The Contour 1 gives you the same potential with faders and CV inputs, plus a few refinements, in 8HP. It can be an AD envelope, an AR envelope, a looping LFO, a track-and-hold processor, or a surprisingly stable 1V/oct oscillator when pushed into audio rate. The manual also notes its use as a frequency divider, though that's more a side effect than a primary function. Its control over slope shape is very precise.

Despite its low profile, the Contour 1 demands attention. The build quality is consistent with Joranalogue’s reputation—solid, no-nonsense, with tactile sliders that feel like they’ll outlast the rest of your rack. The front panel is minimal, almost austere, with no flashy graphics or cryptic symbols, just labeled jacks and two long faders that invite hands-on manipulation. And that’s where the magic happens: tweaking the rise and fall sliders while a sequence runs through it can transform a rigid pattern into something organic and lopsided, like a heartbeat under stress. It’s not a “pretty” module in the traditional sense—there’s no lush pad generation or harmonic richness here—but its voice is one of architecture and motion, of voltage in flux. When used as an oscillator, it doesn’t sing; it pulses, slides, and warps, carving out timbres that feel more like physical gestures than musical notes.

Specifications

Manufacturer	ALM Joranalogue
Production Years	2019–present
Original Price	$187 USD
Format	Eurorack
Width	8 HP
Depth	30 mm
Current Draw (+12V)	90 mA
Current Draw (-12V)	85 mA
Rise Time Range	500 μs to 30 s
Fall Time Range	500 μs to 30 s
Slope Shape Control	Adjustable Bend (exponential to logarithmic), CV controllable
Inputs	Gate, Trigger, Hold, Signal Input, Rise CV, Fall CV, Bend CV
Outputs	Normal Output, Inverted Output, Rise Trigger, Fall Trigger
Loop Mode	Switchable
Manual Trigger	Front-panel button
1V/Oct Tracking	Yes, when used as VCO
Functionality	Slew limiter, AD/AR envelope, LFO, oscillator, track and hold, frequency divider
Weight	Approx. 100 g

Key Features

Independent Slope Shaping with Voltage Control

The standout feature of the Contour 1 isn’t just that it lets you control rise and fall times independently—it’s that it lets you warp the shape of those slopes in real time. The Bend parameter, available for both rise and fall, continuously shifts the curve from exponential (fast attack, slow tail) to linear (straight ramp) to logarithmic (slow start, sudden drop). This isn’t just a tonal tweak; it fundamentally changes how the voltage behaves in your patch. A logarithmic fall on a bass sequence, for example, can create a sense of tension release that feels almost vocal. And because both Bend parameters have CV inputs, you can modulate the shape itself with an LFO, a sequencer, or even audio-rate signals. Try routing a slow sine wave into the Bend CV and watch your envelope morph from smooth to spiky and back again—this is where the module stops being a utility and starts being an instrument.

Hold Input for Dynamic Freezing

The Hold input looks simple on paper but opens up a lot of patching options. When a gate is applied to the Hold input, the slew circuit freezes and holds the current voltage. This turns the Contour 1 into a track-and-hold processor, which sustains a voltage until the hold signal drops. It works in both slewing and looping modes, so it's useful for freezing a drifting melody or creating stuttering rhythmic effects. You can also use it to "pause" an LFO mid-cycle, or to latch a control voltage from a chaotic source.

Audio-Rate Operation and 1V/Oct Tracking

The Contour 1 is primarily a CV processor, but it also works as an audio oscillator. With rise and fall times in the microsecond range and loop mode engaged, it generates clean, stable waveforms that track 1V/oct with impressive accuracy. It won't replace a dedicated VCO for complex timbres, but it's expressive as a source of pulsing, sliding, or stepped tones. The Bend controls let you shape the waveform, so you're not limited to standard waveforms and can create custom slopes that evolve over time. Pair it with a filter and you've got a minimalist lead generator, especially when modulating the shape with external CV.

Historical Context

The Contour 1 exists because the analog modular community never stopped obsessing over the slope generator. The concept dates back to the Buchla 281 and was refined in the Serge DUSG, where it became a cornerstone of West Coast synthesis—less about melody, more about motion, gesture, and unpredictability. For decades, these circuits were niche, requiring deep patching knowledge and often living in the shadow of more “musical” modules. But with the Eurorack boom of the 2010s, designers began re-examining these foundational circuits, asking: what if we made them more accessible, more controllable, more versatile?

ALM Joranalogue's answer was the Contour 1. Released in 2019, it arrived during a period of renewed interest in West Coast synthesis, alongside modules from Make Noise, Verbos, and XAOC. Competitors like the Make Noise Maths offered complexity through multiple modes and digital behavior. The Contour 1 stayed analog and hands-on. It's not a direct clone of the DUSG. It's a refinement, with smoother response, more consistent tracking, and additions like the Hold input and a dedicated loop switch. It's also significantly more compact than many of its ancestors, fitting into 8HP where others took 16 or more.

Collectibility & Value

The Contour 1 isn't a rare module. Production has been steady since 2019. It rarely shows up on the used market because owners tend to hold onto it. When it does appear, prices typically range from $180 to $220 depending on condition and region, against an original $187 MSRP. There's little to no collector's markup, since it's a working module rather than a trophy piece.

Failures are rare, but not unheard of. The sliders, while high-quality, can accumulate dust over time, leading to crackling or inconsistent response. Contact cleaner usually fixes this. In extreme cases replacement may be necessary, though the design makes servicing straightforward for experienced technicians. The Hold input's sensitivity to weak or slow signals has been noted in some patches, but this is more a design quirk than a flaw. It's meant to respond to clean gate signals, and erratic sources may require buffering. Power draw is moderate (90mA/+12V, 85mA/ - 12V), so it won't strain most cases, but users with tightly packed skiff builds should account for it.

When buying used, check that both sliders move smoothly across their full range and that the manual trigger button produces a clean voltage spike. Test the loop mode with a clock signal to ensure stable cycling, and verify 1V/oct tracking if you plan to use it as an oscillator. The module has no firmware or calibration quirks.