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Difference between MIDI editor and MIDI piano roll?

while using mouse modifiers in preference i notice there were two options midi editor and midi piano roll?

 Yes 👌 you’ve spotted something important in REAPER’s Mouse Modifiers preferences:

When you open Preferences → Mouse Modifiers, you’ll see contexts like:

  • MIDI editor

  • MIDI piano roll

  • (and also MIDI CC lane, MIDI velocity lane, etc.)

🎹 Difference between them

1. MIDI editor (global context)

  • Applies to anywhere inside the MIDI editor window.

  • This includes the piano roll, CC lanes, velocity lane, ruler, etc.

  • Example: Right-drag in empty space = marquee select.

2. MIDI piano roll (specific context)

  • Applies only to the note area where the rectangles (notes) are drawn.

  • Doesn’t affect CC lanes, velocity, or ruler.

  • Example: Left-click in piano roll = draw note (but won’t affect CC lane).

✅ Why both exist

  • MIDI editor = broad/general behaviors.

  • MIDI piano roll = precise control just for working with notes.

That way you can, for example:

  • Make right-drag in the CC lane = draw automation.

  • Make right-drag in the piano roll = erase notes.

Without the separation, both areas would behave the same.

👉 Do you want me to break down all the different MIDI mouse modifier contexts (piano roll, CC lane, velocity lane, ruler, piano keyboard, etc.) so you know what each is best used for?

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