4ms EnvVCA (2023)

Name: 4ms EnvVCA
Brand: 4ms

A small analog module that works as an envelope, an LFO or an audio-rate oscillator, with a wide time range and a VCA built in.

Overview

The 4ms EnvVCA is an envelope, a slow modulator, a trigger machine and a clean exponential VCA in an 8HP panel. The rise and fall sliders run from glacial sweeps to audio-rate zaps. You can patch it as a standalone envelope for a VCO, or set it to self-cycling LFO mode to modulate a filter. You can route its VCA to duck a drone, or push it into audio-rate oscillation for gritty, organic waveforms that no digital LFO can mimic. There are no menus, screens or firmware updates involved.

Compared to other compact envelope/VCA combos, the EnvVCA stands out for its time range and for its simplicity. There's no waveshaping, no CV offset per envelope segment, and no slew smoothing on the envelope output. It isn't the Shaped Dual EnvVCA, and it's better for knowing exactly what it is. It's half the Dual EnvVCA, minus the extra VCA CV input and offset knob. Two rise/fall sliders with three-range switches take you from milliseconds to 20-minute-long swells in a single flick. That span covers anything from tight percussion to ambient tides, and the exponential VCA response keeps audio signals swelling and decaying musically.

It looks like an afterthought: small, unassuming, no flashy lights or endless jacks. It ends up being the glue in a lot of patches. Need a quick ASR envelope for a pluck? Patch it and go. Want to modulate a delay feedback with a slowly evolving wave? Patch the envelope out, hit cycle, and let it run. The dedicated level slider on the envelope output scales it for modulation depth. The VCA is clean enough for delicate audio work and tough enough to handle hot CV or distorted signals.

Specifications

Manufacturer	4ms
Production Years	2023
Original Price	$159.00 USD
Format	Eurorack
Width	8HP
Depth	24mm (0.95")
Power Connection	10-pin Eurorack power header
Power Consumption (+12V)	120mA
Power Consumption (-12V)	110mA
Polyphony	Monophonic (single channel)
Oscillators	None (envelope generator with audio-rate capability)
Filter Type	N/A
Effects	None
MIDI	No
Keyboard Size	N/A
Envelope Generator	Analog linear rise/fall with exponential response
VCA Type	Low-noise exponential VCA
Minimum Rise/Fall Time	~12ms
Maximum Rise/Fall Time	~20 minutes
Time Range via CV	Extends from ~400µs to ~1 hour
Envelope Outputs	Env Out (unipolar, 0–10V typical)
VCA Inputs	Audio In (DC-coupled, 100k impedance)
VCA Outputs	Audio Out (1k output impedance)
Trigger Input	Rising edge, 1.25V threshold
Cycle Function	Manual button and CV-controllable
End of Rise Output	Gate output (~5V)
Follow Input	For slew limiting and envelope following
Weight	Approx. 120g

Key Features

Analog Simplicity with Extreme Range

The EnvVCA's sliders work with a three-way range switch that toggles between fast, medium, and slow envelope times. You get snappy transients and slow evolutions from the same module. A 15ms percussive hit and a 15-minute ambient swell both behave smoothly and predictably. The analog circuitry means no digital stepping or quantization, just continuous sweeps. It's DC-coupled, so it handles both audio and CV.

Integrated Exponential VCA

The built-in VCA is a low-noise exponential amplifier that follows the envelope's output. When the VCA CV input is unpatched, it tracks the envelope automatically, so it works for shaping audio with no extra patching. Patch in an external CV and you can override or modulate the gain independently. The gain range is -90dB to +2dB, with unity gain at 4.4V CV across the audio band. It won't color your signal unless you push it, and even at extreme settings distortion is minimal. That suits both subtle ducking and full amplitude modulation.

Self-Cycling and Modulation Flexibility

Hit the cycle button and the EnvVCA becomes a free-running LFO with a smooth, exponential wave. Unlike many envelope generators that struggle with stable low-frequency oscillation, this one stays stable even at sub-audio rates. The cycle function can be controlled via CV, so you can switch between triggered and looping modes on the fly. The end-of-rise gate output lets you chain events or trigger secondary envelopes.

Historical Context

The EnvVCA arrived in 2023 as part of 4ms's push to refine and expand their utility-focused Eurorack lineup. Many manufacturers were chasing complexity at the time, with multi-mode envelopes, digital wavetables and FM-capable LFOs. 4ms stayed with analog and practical design. The EnvVCA wasn't an attempt to reinvent the envelope. It's a compact envelope/VCA aimed at everything from precise synthesis to experimental sound design. It shares DNA with the Dual EnvVCA and the more advanced Shaped Dual EnvVCA, and sits between them for users who want analog depth without the HP cost or interface complexity.

Many modules in the ecosystem were menu-heavy or hybrid digital-analog designs. The EnvVCA stayed fully analog. It competed not with modules like MakeNoise Maths or ALM Busy Circuits Quadrax, but with simpler workhorses like Intellijel Dual ADSR or Pittsburgh Modular Lifeforms SV-1. Those modules often prioritized traditional envelope shapes. The EnvVCA goes from audio-rate to ultra-slow modulation, cycles, and works as both a CV and audio processor.

Collectibility & Value

As of 2026, the 4ms EnvVCA remains in production and is available new from retailers for $159. On the used market, it typically sells for $120 - $140 in excellent condition. It's not a "grail" module, but it doesn't get traded out much either. There are no known chronic failures or design flaws. Service technicians observe that the sliders and switches are robust, and the analog circuitry is well-protected against voltage spikes. The one caution for buyers is power draw: at 120mA on +12V and 110mA on -12V, it's not light on current, so racks with tight power budgets should plan accordingly.

Because it's a recent module, there's no vintage premium or scarcity-driven inflation. Used listings turn over quickly, especially when bundled with other 4ms modules. Collectors note that it pairs well with the 4ms Dual Envelope Generator or SWN for expanded modulation, but it's equally at home in minimalist setups. There's no firmware to update, no calibration required, and no hidden quirks.