This parameter shows generated MIDI output.

It is useful for visual feedback about the effect of parameter changes. The Overview page uses it to offer you a bird's eye perspective on your score.

Notes are color coded.

Note matches the current bass, which may or may not be included with the chord.
Note belongs to the chord.
Note belongs to the vertical scale.
Note is a chromatic alteration not in the vertical scale.
Important: This parameter is read-only. Although you can select and inspect all notes, you can't edit them. This wouldn't make sense because any parameter change anywhere in the arrangement will make your edits obsolete as soon as all output is generated anew from scratch.