Author: kdk ★2017
Date: 2012-08-05 03:49
It's always seemed to me that if speed causes something, whether it's sound, fingering, rhythm or anything else, to degrade, then the speed is causing something to change. The logical fix is to slow down to a point where everything is under control and sounds good. Then add speed incrementally, concentrating on not changing anything except the speed. If the player reaches a point at which something bad happens, then some analysis is needed to identify what went wrong, what changed. Once that's been worked out, the goal is again to start a little slower, this time being forewarned about the problem and concentrating on avoiding it.
Have the student play a passage slowly enough that the tone and voicing are under control. Then have him or her speed up a little at a time (using a metronome if necessary to control the speed increases), listening at each repetition for some change in the tone or voicing. Either the change will appear at some point and you can discuss it and get the student to identify and recognize it, or else by approaching a faster tempo in small steps the student will be able to reach a target tempo without having the sound get brittle, giving him or her a set of new sensations to try to reproduce on future attempts.
Karl
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