MFX SustainFix is a small MIDI utility (historically distributed as a plugin/patch) that fixes sustain/hold-pedal and related MIDI CC issues by remapping or filtering MIDI CC messages and sending explicit note-off/All Notes Off commands when needed.
Best-practice installation & usage (assume a Windows DAW host that supports MFX-style plugins or a standalone MIDI utility):
- Prepare
- Back up current MIDI project and settings.
- Identify the problem: stuck notes, reversed pedal polarity, unwanted CC routing, or missing note-offs.
- Note the MIDI input/output ports and channel(s) used by your keyboard/controller and synth.
- Install
- Place the MFX SustainFix plugin/module into your host’s plugin/macro folder per host instructions (or run the installer if provided).
- If your host requires rescanning, rescan plugins.
- Configure MIDI routing
- Insert or enable SustainFix in the MIDI chain
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