QVERB MIDI Studio — Help
A browser-based editor and librarian for the Alesis Quadraverb and Quadraverb Plus. Everything runs locally in your browser using the Web MIDI API — no installs, no drivers, no cloud dependency for your patches.
Getting started
- Open QVERB MIDI Studio in a Web MIDI-capable browser (Chrome, Edge or Opera).
- Connect your Quadraverb to your computer with a MIDI interface. Cable OUT from the interface into IN on the Quadraverb, and the return cable from the Quadraverb OUT to your interface IN.
- Open the menu (☰ top right) and pick MIDI Configuration. Click Connect MIDI and grant permission — including SysEx, which is required for parameter editing.
- Pick the correct MIDI Out, In and channel to match your Quadraverb.
- Choose a preset from the Patch Library and start editing.
What you can do
- Edit every reverb, delay, pitch, EQ and modulation parameter over SysEx in real time.
- Browse curated guitar presets and cinematic soundscapes tuned for the Quadraverb.
- Save your own patches to a personal library that stays in your browser.
- Generate new patches from a text description using AI, or ask the AI to edit the current patch.
- Load and send
.syx,.ssxand JSON patch files. - Back up factory presets, so you always have a clean starting point.
A short history of the Alesis Quadraverb
Released by Alesis in 1989, the Quadraverb was the first affordable rack unit that could run four studio-grade effects — reverb, delay, pitch and EQ — simultaneously. Its 20-bit internal processing and clean digital reverbs put high-end studio sound in the hands of bedroom producers, guitarists and live engineers for a fraction of the price of a Lexicon.
The follow-up Quadraverb Plus (1991) added sampling, ring modulation and a Leslie simulation, and the Quadraverb 2 (1993) extended it further with 8 simultaneous effects and moving-fader-style modulation routing. Decades later the Quadraverb family still shows up on records — famous for its dense hall reverbs, tape-like delays and character-rich chorus — and remains a favourite for ambient guitar and lo-fi production.
Troubleshooting
- Web MIDI unsupported — Safari and Firefox don't support Web MIDI. Use Chrome or Edge.
- SysEx blocked — SysEx only works over
httpsorhttp://localhost. Opening the file locally viafile://disables parameter edits. - No signal / no effect — check the channel matches the Quadraverb, and confirm the unit is in a MIDI-controllable mode.
Quadraverb, Quadraverb Plus and Quadraverb 2 — how they compare
QVERB MIDI Studio talks to the whole Alesis Quadraverb family. The units share a common SysEx dialect but differ in effects count, extras and internal resolution.
- Alesis Quadraverb (1989) — the original. Four simultaneous effects (reverb, delay, pitch, EQ), 16-bit converters, 20-bit internal processing, 100 program slots. Famous for its dense hall reverbs and clean pitch shifting.
- Alesis Quadraverb Plus (1991) — adds sampling (up to ~1.6s), ring modulation and a Leslie rotary simulation. Same 4-effect architecture, extended configuration list, otherwise-identical MIDI SysEx implementation.
- Alesis Quadraverb 2 (1993) — 8 simultaneous effects, moving-fader-style modulation matrix, higher-resolution converters and a redesigned SysEx map. It is a related but different protocol — QVERB MIDI Studio focuses on the original and Plus, and treats the QV2 as a compatible librarian target where the parameter overlap allows.
If you're deciding which unit to buy: pick the Plus if you want the classic Quadraverb sound plus Leslie and ring mod; pick the QV2 for denser multi-effects chains and modulation routing; pick the original for the purest cost-effective take on the 1989 reverb sound.