MIDI Piano Roll (CPU / GPU)

Shows notes as rectangles scrolling along time. MIDI Piano Roll (CPU) and MIDI Piano Roll GPU share the same settings and differ only in the rendering method.

Settings

In addition to the common settings (Source Mode / MIDI File / Time Mode / Low Key / High Key):

Setting	Default	Description
Direction	Vertical (Down)	Vertical (Down) = falls from the top (X matches the keyboard) / Horizontal (R to L) = flows right to left (each pitch is a lane)
Time Mode	Time (sec)	Time axis unit (seconds / beats)
Low Key / High Key	21 / 108	Pitch range shown (0–127)
Roll Window	6.0 (0.01–120)	Visible time span (seconds). Smaller scrolls faster
Playhead %	85 (0–100)	Playhead line position (from top for vertical / from left for horizontal). ~15% reads well in horizontal mode
Note Border	on	Draw a border around note rectangles (helps at high density)
Width / Height	760 / 400	Render size (px)

CPU vs GPU

	MIDI Piano Roll	MIDI Piano Roll GPU
Rendering	CPU	GPU
Settings	same	same
Use	general	when you want it light at high density / resolution

Notes

• Colors come from MIDI Source.
• Place a MIDI Keyboard directly below a Vertical roll with the same Low / High Key to align keys.
• Occlusion (skipping fully hidden older same-pitch notes) keeps Black MIDI light. A smaller Roll Window is lighter still.