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I think it is mainly a problem of saturation.

If the theme is dark gray (saturation 0), demand tracks with very saturated and light color.
Try #eaff04.

If you look at your events, the ghost notes are much more readable.

Another solution, as Rui indicates, is to darken the background in notes a little more. Not as much as in events, because the truth is that one of the cool things about your theme is clearly distinguishing the notes and events area, but something else.