13.20 F3 - The Panic Button
The F3 key can be your best friend when you are working in the MIDI Editor (and also when you are playing back MIDI items in REAPER's main Arrange View).
Kind: concept (user-guide-section) Chapter: 13 Working with MIDI Items Source: REAPER User Guide v7.70
The F3 key can be your best friend when you are working in the MIDI Editor (and also when you are playing back MIDI items in REAPER's main Arrange View). Pressing F3 will set all notes to all MIDI outputs off, until you stop and recommence playback.