Glad to hear that you two couldn't help
Hi, I have certain question about thrills. I have problem with making nice quick one-hand thrill, when second hand are playing other voice(s). Can anybody give me advice of practice to arch over this problem ?
One word: ALIGNMENT
Practice them slowly at first, making sure the trill is aligned with the beat and the other notes. It also helps to think "exactly what is this trill?". If you know how the trill goes, you can then work to coordinate (BTW, coordination is EVERYTHING in technique). Does the trill consist of sixteen notes played in two groups of eight or is it a transient one of three? Whatever the trill, it must be accurately executed to be aligned with everything else.
This a case for Hanon, take a look at exercise 46, sometimes this one can "wake up" the fingers. Just don't overdo it!
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An important thing not to overlook: Be absolutely sure that the other voices are played perfectly in time. If the accompaniment is out of whack, trilling accurately is virtually impossible. The accomp. is the framework to a sound musical structure. The trills are decorations.
One more point...write out the offending trill! I cannot stress that enough. This will quantify the task, and knowing is half the battle!