Practice.
Also:
Interval training!
------------------
This is what physical trainers (i.e. gym) do to get people's fitness levels up. It's good for singles, doubles, paradiddles, whatever you want to get faster.
Using a metronome, start at an easily controllable speed that you can play with precision. Then jack the metronome up 5bpm, play for 2-5 minutes (I use 5 minute intervals, but sometimes there's not enough spare time to devote to it).
Keep going up in intervals of 5bpm until you hit a speed that you can barely control - then back down 5bpm (you should be able to control this speed) and this will be your 'control speed'. Play solidly on your control speed for 5 min, then go up 5bpm and practice here for 5. After doing this for long enough, you should be able to control this new speed.
What you're trying to do is slowly push your control speed up in increments of 5bpm. When you have a new control speed, push forward another 5bpm.
Voila.
Bookmarks