I’ve upgraded from a Yamaha P45 to a Casio Privia PX870. I am generally happy with the new Casio, except that most of the 6th octave sounds overly bright compared to the rest of the keyboard. I play mostly classical music at advanced intermediate level, so I live on the Grand Piano setting. I have spent time messing about with the settings, but I don’t know that I’ve landed on the best combination of settings for my purposes.The Casio has many more settings than I'm familiar with And I can’t seem to correct the specific brightness problem. Is there a video or some resource that provides more detailed info and definitions on the purpose of each setting than what’s found in the Users Manual?