Hi Antonuk, there are several things you should know: 1. there is great difference between the S950 to the SX90O. you must understand that the SX900 has a totally different operating system to the S950, so it must adapt to the new system. 2. I do not know what it refers to with small fonts on the screen, (letters or icons), if it is lyrics for songs, I advise you to download the latest update of the operating system (v 1.05) on the website of yamaha, in which several bugs were fixed and among them the increase of the font for song lyrics. 3. A new feature called PLAY LIST appears on the SX900, replacing the old MUSICFINDER. 4. In terms of styles, you do not specify whether they were made directly on your previous S950, or if you used YEP to create an expansion pack. Remember that the current expansion data software is YEM, so you will need to download the software to your computer and update your old expansion packs via YEM. I hope this helps. If it's not clear, you can republish, someone here with more experience will be able to help you. Best regards. Hans