Also remember two important facts:
1. When a pianist plays a fast passage and it sounds completely uniform and clear, such uniformity is mostly an illusion. We “hear” uniformity, but actually there is quite a lot of variation in it. You can easily confirm that by listening to the midifile of a scale written on a notation program – it will be mathematically uniform – and comparing it to a scale that is played by a pianist – which is not mathematically uniform, but will sound much more so than the midifile generated by the computer. So do not try to impose a “mathematical uniformity to it (by using a metronome, for instance) since it will actually sound non-uniform. Instead, rely on your ears to check if you are creating the illusion of uniformity.
2. This second point is far more important. You do not want to play uniformly. You want to sound uniform, and in order to sound uniform, you must move in a most irregular way. If you consider a scale for instance, the passing of the thumb must be speeded up and the movement of consecutive fingers must be slowed down if you want the scale to sound uniform. However, language tends to confuse us here. The teacher says: “you must play more uniformly”, when what he actually means is: “You must play in such a way as to produce a more uniform sound”.
Best wishes,
Bernhard.