schwung-midiverb

Schwung audio-FX module that emulates the Alesis Midiverb, Midifex, and Midiverb II rack reverbs (1986, 13-bit DASP DSP at 23.4 kHz).

DSP based on thement/midiverb_emulator (GPL-3.0).

You must supply the ROMs

The effects are the units' own DSP programs, and they are not ours to distribute: no ROMs and no effect algorithms are included. The module runs each unit's program ROM on a cycle-accurate interpreter of its DASP DSP. Upload your own dumps on the module's page in Schwung Manager (or copy them into the module's roms/ folder):

Unit	File	Size
Midiverb	midiverb.rom	16384 bytes
Midifex	midifex.rom	16384 bytes
Midiverb II	midiverb2.rom	32768 bytes

Any subset works. A unit without its ROM is marked (no ROM) in the Unit menu and passes audio through unchanged.

Versions before 0.3.0 bundled decompiled copies of the effect programs. They were removed in 0.3.0.

Programs

• Midiverb: 64 programs
• Midifex: 64 programs
• Midiverb II: 100 programs

UI

Jog wheel scrolls programs, Unit submenu picks between the three units. Knobs 1-8: Mix, Feedback, Input Gain, Output Gain, Pre-delay, Low Cut, High Cut, Width.

Build

./scripts/build.sh
./scripts/install.sh

Credits

• DSP: thement/midiverb_emulator (cycle-accurate DASP interpreter, LFO tables) — GPL-3.0
• Schwung integration: Charles Vestal
• Original hardware: Alesis (1986–1987)

Alesis, Midiverb, Midifex, and Midiverb II are trademarks of inMusic Brands, Inc. This module is an unofficial software emulation, not affiliated with or endorsed by Alesis.

License

GPL-3.0-or-later. See:

• LICENSE — full GPL-3 text
• NOTICE — project attribution + trademark disclaimer
• src/dsp/THIRD_PARTY_LICENSES.md — per-file vendoring details