First, please add a feature that makes the background flash(also can set which color to flash in) while pressing a key. It seems possible with After Effects, but in seemusic, there is no such feature yet.
Second, even if the note size is set to 0, make sure that the size of the black and white keys is different. Currently, if the note size is set to 0, there is no difference in size between the black and white keys. There is a size difference only when the size is set to a certain height or higher.
I want the average note size to be 0 and the black keys to be lower, but now if I set the size to 0, the black and white keys have the same thickness. This might makes it difficult for viewers to distinguish whether they are pressing a black key or a white key when viewing the video.
These two features are desperately needed. It would be nice if these features were actually added.