Does sitting high or low at the piano affect the performance?
Generally, high or low seat at the piano is not recommended. If you keep your stool at too high or at low level, you will use more of your shoulders and arms rather than you fingers, and this is harmful to the technique.So, do not raise the piano stool too high.
As far as exact height of the seat is concerned, you will need to experiment for yourself to figure out the height of the seat at which you can play the piano or keyboard for a long time with the least fatigue.