Practice routine for the COORDINATION of the fingers.
Let's make a 2323232.. trill
Exercise A
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1. Put your right hand hand on the keyboard. First finger on C and 4th finger on F. Press both keys and let those finger there. (So the movements of your hand are restricted).
2. First, make sure you can play repeated notes with finger 2:
2222, 2222, ...
then 22222222, 22222222...
up to 16 22222's.
the coma (,) represent a little rest
Use minimal finger motion, do not lift the finger from the keys. Finger 3 is resting on the surface of E, without pressing.
3. Now do the same with finger 3. Finger 2 is resting on D.
4. Now do the same with both fingers togheter. Make sure there is finger motion and that you are not pressing with your hands (this comes later).
5. Start exercise 2 but insert a note with the other finger every 4 notes, then every 3 then every 2 notes then to finger togheter.
2.3 is a chord (2 and 3 togheter)
2 2 2 2 2.3 2 2 2 2.3 2 2 2 2.3 2 2 2 ....
2 2 2 2.3 2 2 2.3 2 2 2.3 2 2 ..
2 2 2.3 2 2.3 2 2.3 2 ...
2 2.3 2 2.3 2 2.3 ...
2.3 2.3 2.3 2.3 ....
Check you are doing 2.3 with your fingers and not pression both keys with your hands.
6. Do the same with 3.
3 3 3 3 3.2 3 3 3 3.2 ...
7. Check your trills.
Exercise B
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1. 2 2 2 2 rest 2 2 2 2 rest... You pass this when you can do this 7 times well.
2. 23 23 23 23 rest 23 23 23 23
3. 232 232 232 232..
4. 2323 2323 2323 2323 2323
5. 23232 .....
and so on..
Combine exercise A and B. Create others and then tell me your results.
I agree completly with the other post but they are advanced pianists and they seem worried about relaxation, wrist, forearms,.. VERY IMPORTANT THINGS but you have to teach your BRAIN to COORDINATE the fingers first. Then you will control volume of the sound, speed, and other things with the rest of your body.
Other TIP: TRY TO NOT THINK ON THE RYTHM!!!!! CONCENTRATE ON THE MOVEMENTS FIRST (not ever, but do this kind of practice too -rythmless? practice-). Put your walkmans on, listen to a piece you like, while trilling on a table or on a digital keyboard switched off, then try to transfer this piece you are listen (and you like) to the trill. Check you are trillin 2323232.... speed up and down as you listen the piece. Trill without thinking and try to relax!. Do this a couple of days. Then do the trill on a real piano. Works wonder to me. (thanks Bernhard)
Hope it helps.
Ale
SORRY MY ENGLISH.