Please don't be angry with me, but limiting the notes to 10 is a bit strange! But to limit the total number of characters in all notes to a value of ~1500chars, so that you can't even write enough information for all tracks, this is really crazy in this day and age. It is just 6kByte with a 4Byte-encoding, which is currently available to every account! With currently two million player-accounts, that's just 12 GB uncompressed or 1.2 GB compressed! However, all 2 million accounts have to fill in the notes up to the last letter to !
I save myself any comparison with today's storage prices! Therefore I would urgently ask you to cancel the limit of 1500 characters or set the limit up to a much higher value! I think the notes are saved in the database (why they should otherwise be so strictly limited), it is not much work to raise the limit.