The note edit widget is available as linking an editor index with a notes sequencer e.g. Soundfont2 file player.
Left, Left-Arrow
Move within notation left, as there is a note you get an audible feedback.
Right, Right-Arrow
Move within notation right, audible feedback as above.
Up, Up-Arrow
Move within notation up, audible feedback as above.
Down, Down-Arrow
Move within notation down, audible feedback as above.
Space
Add audio notes and give audible feedback.
Delete
Remove audio notes and give audible feedback.
Ctrl+c
Copy the selected notes to clipboard.
Ctrl+x
Cut the selected notes to clipboard.
Ctrl+v
Paste notes from clipboard.
Ctrl+a
Select all.
Ctrl+i
Invert all.
Tab
Leave notation focus.