SysEx Librarian
Free macOS MIDI utility for sending, receiving, organizing, and inspecting System Exclusive data used by synthesizers and other MIDI hardware.
What is SysEx Librarian?
SysEx Librarian is a free macOS MIDI utility published by Kurt Revis on Snoize. It is designed for working with System Exclusive, or SysEx, data exchanged by MIDI devices such as synthesizers, sound modules, and other music hardware. The app can record SysEx dumps from connected devices, store them in a library, and send saved data back to hardware for patch backup, restoration, and firmware-related transfers. It supports importing raw .syx files and reading SysEx data from standard MIDI files, and it includes detailed message viewing for inspecting data contents. Its documentation also notes features for reacting to MIDI program changes and for adjusting transmission behavior for devices that need slower or more careful delivery. Mac users commonly encounter it in studio, live-performance, and vintage-hardware workflows where reliable SysEx management is needed.
Key features
- Record SysEx data from connected MIDI devices into a reusable library.
- Send saved SysEx files back to synthesizers and other MIDI hardware.
- Import raw .syx files and read SysEx data stored inside standard MIDI files.
- View individual SysEx message contents in hexadecimal and ASCII formats.
- Organize multiple SysEx files with names, manufacturer details, message counts, and sizes.
- React to MIDI program changes to trigger sending stored SysEx files.
- Adjust transmission behavior for MIDI devices that need slower or more controlled transfers.
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Safe
This is a legitimate MIDI utility from Snoize and Kurt Revis. Its main risk is operational rather than malicious: sending the wrong SysEx data or interrupting a transfer can overwrite patches, alter device settings, or fail a device update on connected MIDI hardware.
Recommendation: Keep it if you use MIDI hardware, synthesizer patch backups, or SysEx transfers. Remove it if you no longer work with compatible MIDI devices and do not need its saved libraries or preferences.
Common paths
/Applications/SysEx Librarian.app~/Documents/SysEx Librarian
Preference paths
~/Library/Preferences/com.snoize.SysExLibrarian.plist
Share your experience
Be the first to share your experience.