ReaperERA

 Yes, REAPER includes several native actions in the Main and MIDI Editor sections for moving the edit cursor specifically to the start and end of items or selected events. Native Actions in the Main Section (Arrange View) In the main project window, you can use the following actions found in the Action List (press ? ) to navigate between item boundaries: Item navigation: Move cursor to start of items: Moves the edit cursor to the beginning of the selected media item(s). Item navigation: Move cursor to end of items: Moves the edit cursor to the end of the selected media item(s). Item navigation: Move cursor left to edge of item: Moves the cursor to the nearest item edge to the left. Item navigation: Move cursor right to edge of item: Moves the cursor to the nearest item edge to the right. Native Actions in the MIDI Editor Section If you are working specifically with MIDI notes within the MIDI Editor , these actions allow you to jump to the start or end of your curren...

 You can create a custom action using only REAPER's native commands to insert a MIDI item that is exactly four bars long. This is achieved by using the edit cursor to define a time selection before triggering the insert command. As the sources note, if you define a time selection before choosing Insert > New MIDI item , the newly created item will automatically match the length of that selection. Custom Action: Insert 4-Bar MIDI Item To build this macro, follow these steps: Open the Action List (press ? ). Click New action... and select New custom action... . Name your action (e.g., Insert 4-bar MIDI item ). Drag the following native actions from the left pane to the right pane in this exact order: Navigate: Move edit cursor to start of measure (Ensures the item starts perfectly on the bar line). Time selection: Set start point . Navigate: Move edit cursor right one measure . Navigate: Move edit cursor right one measure . Navigate: Move edit cursor right one m...