GroovEmu Arranger: Free REAPER Arranger System for Windows
GroovEmu Arranger is a free Windows-only system that converts REAPER into a live arranger-style workstation, released by Estonian developer Marko Karja under his SlapAsSound label. The download is available directly from the developer with no registration or time limit.
What GroovEmu Arranger Does
GroovEmu Arranger adds arranger-keyboard workflows to REAPER: style-based accompaniment, chord recognition, and real-time pattern triggering. It runs as a ReaScript + JSFX toolkit inside REAPER rather than as a standalone VST plugin, so it integrates with the DAW's native routing and project structure.
System Requirements & Formats
- Host: REAPER 6.0 or later (64-bit)
- OS: Windows 10/11 (no macOS or Linux build)
- Formats: ReaScript (EEL/Lua) + JSFX — not a VST3/AU/CLAP plugin
- Dependencies: SWS/S&M extension recommended for full feature set
Licensing & Download
The system is royalty-free for commercial and non-commercial use. No licence key, account creation, or newsletter sign-up is required. Grab the latest release from the SlapAsSound product page.
Download GroovEmu Arranger free
Quick facts: GroovEmu Arranger is a free Windows-only ReaScript/JSFX toolkit that adds live arranger functions to REAPER. It carries a royalty-free licence with no sign-up or expiry date.
FAQ
Is GroovEmu Arranger really free? Yes, the full system is free to download and use commercially with no hidden costs.
What DAWs does it support? Only REAPER on Windows 10/11. It does not work in other DAWs or on macOS/Linux.
Does it install as a VST plugin? No. It runs as ReaScript and JSFX files inside REAPER, not as a VST3/AU/CLAP plugin.