These are my most used keyboard shortcuts that I actually use in FL Studio.
THE PIANO ROLL KEYBOARD SHORTCUTS
Command + A (or Ctrl + A on Windows) selects all notes. Command + D (on Mac) or Ctrl + D (on Windows) deselects the selected note(s).
Command + L (or Ctrl + L on Windows) quickly extends the selected note to fill the gap up to the next note.
Shift + D shortens the selected notes to a default length (usually a 1/4 note or the default grid setting)
Option + K (Mac) or Alt + K (Windows) opens the Piano Roll - Limiter/Transposer (I have it so it transposes the notes to C)
Option + Y (on Mac) or Alt + Y (on Windows) opens the Score Flipper in the Piano Roll
Option + U (or Alt + U on Windows) opens the Chopper tool in the Piano Roll (I use it mainly for hihat rolls)
Option + S (on Mac) or Alt + S (on Windows) opens the Strumizer in the Piano Roll.
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THE PLAYLIST KEYBOARD SHORTCUTS
Command + B (on Mac) or Ctrl + B (on Windows) in the Playlist duplicates the selected pattern or clips.
Option + C, Windows: Alt + C) opens the Cut Tool in the Playlist. When you hold Shift while using the Cut Tool in the Playlist, it constrains the cut to a straight, horizontal line.
Command + X, Windows: Ctrl + X) cuts the selected clip(s) or pattern(s). This removes them from the Playlist and places them on the clipboard, allowing you to paste them elsewhere using Command + V (Mac) or Ctrl + V (Windows).
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THE CHANNEL RACK KEYBOARD SHORTCUTS
Option + Command (on Mac) or Alt + Ctrl (on Windows) while clicking through different drum sounds allows you to quickly swap the selected sound with another one.
When you select all sounds in the Channel Rack and then press Shift + Command + L (on Mac) or Shift + Ctrl + L (on Windows), it links all selected channels to the mixer
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OTHER KEYBOARD SHORTCUTS
Command + S (on Mac) or Ctrl + S (on Windows) saves your project. (I constantly click Command + S while making the beat so It keeps saving the projecti incase it crashes.
Command + R (on Mac) or Ctrl + R (on Windows) opens the export menu to render your project as a WAV file.
Shift + Command + R (on Mac) or Shift + Ctrl + R (on Windows) exports your project as an MP3 file.
Option + R (on Mac) or Alt + R (on Windows) renders the selected mixer track to a WAV file.
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For all of the FL Studio shortcuts check out this: https://www.image-line.com/fl-studio-learning/fl-studio-online-manual/html/basics_shortcuts.htm
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