I bought a Yamaha DGX-220 not too long ago and one thing that I really liked about the original songs that came with it was that they would show you what keys to press and wait for you to press them before proceeding. I've downloaded some .midi files off the internet and have tried to play them, but they all go at their own speed. Does anyone know where I can get some free midi files that support lessons? (More interested in anime and game midis, but I'll settle for any.)