ALR MIDIEditor 40504
From CockosWiki
Filter: Toggle filter on/off (Cmd ID 40504)
Sections: MIDI Editor, MIDI Event List
Toggles the "Filter Events" dialog open/closed. Here you can choose which events are displayed in the MIDI editors. This is also where you switch the editable item, if multiple items (see: secondary items) are present in the MIDI editor window.
Related action: Filter events...