I've returned to playing piano after ending my lessons more than 20 years ago. Currently I have a teacher and getting familiar with playing again. When I ended my lessons I had played pieces by CPE Bach, Haydn, Mozart, Rachmaninoff, Clementi, and was about to learn a Rondo by Beethoven. It wasn't my decision at the time to stop lessons and I'm glad to be able to practice again. At the moment I've learned Sonata K545 by Mozart, Allegro. My problem is knowing if I'm playing well and making the notes sound clear and bright. I've recorded my self and what I hear doesn't sound as graceful or light as some recordings I've heard by professionals. Some sections sound heavy to me. I know I'm not at a professional level, but how do I get my playing to improve so the music sounds as it's intended? My piano teacher tells me I've now learned how to play all the notes - I need to work on dynamics. But I would also like to make my playing sound less heavy. Could it be my piano - it's never been regulated, or is it technique? Both?