Alchemy Lab / Echoa
Echoa
Stereo Dual Delay
and Reverb Processor
Four delay lines total, two per stereo channel. Morph delay into reverb from first principles, from clean digital delay to smeared, textured reflections. Route the four lines in series, parallel, isolation, or spectrally. Presets, parameter lock on every pot, character engines, and more.
Three pages, two lines
Delay into reverb
Two independent stereo delay lines, each with its own time, feedback, mix, engine character, diffuser, multitap, and damping. Three symmetrical performance pages put them side by side, Line 1 on the left and Line 2 on the right. Short times with high feedback give comb resonance, the middle range is stereo delay, and high Diffusion and Bloom turn each line into a plate or hall tail.
Plug in Echoa at the web programmer and set the rest in real time, to your taste. You can see all the performance controls, but you can also adjust the settings in a convenient interface. Route the lines in series, parallel, isolated, or spectrally. Assign the six CV inputs. Pick an engine per line: digital, BBD, tape, vinyl. The interface below is the same real-time controller.
Oh, and parameter lock records up to sixteen seconds of motion on any pot, as a nice bonus.
Play
Settings
Control
Performance Page
Time
The core delay controls, one column per line: Line 1 on the left, Line 2 on the right. Set the delay length and how much comes back here, then use Space and Engine to shape it.
Delay length for line one. Set curve and max delay time in settings.
With Clock Format on 24 PPQN and a clock present, this pot stops being continuous and selects a musical division instead.
Delay length for line two. See line one.
How much of this line's output returns to its input. Below unity the repeats decay, at unity they sustain (green pip), and above it (red pip) the line builds into heavily clipped self-oscillation.
Feedback for line two. See line one.
Blend between the dry input and this line's delayed output.
Mix for delay line two. See line one.
Left channel of the stereo input.
Right channel of the stereo input.
Assignable CV input. Its destination and amount are set on the CV pages.
Assignable CV input. Its destination and amount are set on the CV pages.
Assignable CV input. Its destination and amount are set on the CV pages.
Assignable CV input. Its destination and amount are set on the CV pages.
Assignable CV input. Its destination and amount are set on the CV pages.
Assignable CV input. Its destination and amount are set on the CV pages.
Left channel of the stereo output.
Right channel of the stereo output.
Settings
Configurable for Performance
Routing
Parallel, series, mono, or spectral delay-line topologies.
CV Mapping
Per-CV destination, with attenuverters on every input.
Presets
Save and recall precisely dialed-in delay lines across 16 preset slots.
Output & Layout
Output gain per line, alternate panel layouts, and more.
More
Even more settings to dial in behavior, LED brightness, delay line log/lin, and more.
Features
Performance and
Sound Design Ready
Routing
Audio Routing Modes
Four topologies for the four lines: series stereo, parallel stereo, isolated mono per side, or spectral stereo with a tunable crossover from 100 Hz to 8 kHz. Multitap configuration allows for clean single tap, or up to four taps at different ratios for pounding feedback multiplication or ethereal runaway.
Lock
Parameter Lock on Every Pot
Hold the page button and nudge any pot to record a modulation loop on it. The loop plays back in sync, sums with live pot movement and incoming CV, and clears with another nudge.
Presets
Sound Design Presets
16 preset slots stored in flash, the first loaded on boot. A full snapshot: every parameter, routing choice, CV map, and parameter lock loop.
Character
Character Engines
Digital, BBD, tape, and vinyl engines add character. Digital brings stutter, bit-drop, and micro-mute glitches. BBD rolls off bandwidth in a steep four-pole curve. Tape carries wow, flutter, saturation, pre- and de-emphasis, and shifting hiss. Vinyl brings 33⅓ wow, surface noise, rumble, and crackle.
At a Glance
Specifications
- Format
- 3U Eurorack
- Width
- 12 HP
- Depth
- Skiff friendly
- Power +12 V
- <199 mA (LED-dependent)
- Power −12 V
- <50 mA
- Audio
- 48 kHz / 24-bit stereo
- CV jacks
- 6, field-programmable
- LEDs
- 102 RGB
- USB
- Front-facing USB-C
- Storage
- Micro SD
- Delay lines
- Four (2 stereo channels)
- Delay time range
- 1 ms – 16 s
- Feedback range
- 0 – 110%
- Reverb Control
- Every delay line
- Routing modes
- Series · Parallel · Mono · Spectral
- Parameter lock
- Every pot
- Presets
- 16 slots
- Clock sync
- Tap or 24 PPQN
Open Platform
Use Any Alchemy Lab Firmware
Echoa is one firmware among many on the open Alchemy Lab platform. The hardware is field-programmable down to the silicon: load Spagyros, build your own voice, or contribute back to the SDK.
License
MIT
HAL
Open
Panel templates
Included
Language
C++
