The challenges in the Miraculous Mandarin are all rhythmic – there isn’t much passagework to play. This got a smile out of Mr. Boulez on the first run-through – which isn’t to say it went well.
Practicing something like that with a regular metronome is difficult to say the least. I don’t own a Dr. Beat or anything similar, but from what I have seen it wouldn’t be of much help due to the fast tempo and changing meters. To practice this, I created a couple of rhythm tracks in Finale. One with the steady eight notes, the other with the subdivisions Boulez is conducting. Muting the top staff, I practiced first with the other two and then muted the steady eighth notes to see if my own subdividing added up. Once I could play it arco up to speed, I switched to pizz – just for the heck of it. A rude awakening to say the least so I had to back down the tempo and start over.