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Select all notes in one measure

is there any condition require for shortcut select all notes in one measure in midi editor 

Yes 🎯 — in REAPER the MIDI editor doesn’t automatically know what you mean by “one measure” unless you run the right action.

🔑 The conditions

  1. Time selection or edit cursor position matters

    • REAPER has actions like:

      • Edit: Select all notes in time selection

      • Edit: Select all notes in measure under edit cursor

    • So, to “select all notes in one measure,” you usually need either:

      • A time selection covering that measure, or

      • Place the edit cursor inside the measure you want.

  2. Correct Action Section

    • In Action List, make sure the Section = MIDI Editor.

    • The shortcut won’t work if you assign it in the “Main” section (outside MIDI).

  3. Snap/Grid doesn’t matter

    • You don’t need snapping on — the command looks at measure boundaries, not grid divisions.

⚡ Example workflow

  • Place the edit cursor inside bar 5 → run Select all notes in measure under edit cursor → all notes in bar 5 are selected.

  • Or make a time selection from bar 5 → run Select all notes in time selection → same result.

👉 Do you want me to list the exact action names you should map as shortcuts for:

  • select all notes in measure under cursor

  • select all notes in time selection

  • select all notes of same pitch
    ?

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