hello,
I've found that useful metronome on -line:
http://bestdrumtrainer.com/tt/
you can set the bpm, the meter and, this is useful, the number of measures during wich the metronome is on and off, leaving you playing in silence and allowing you to control your tempo accuracy.
I hope this helps someone. For me It's a great tool (and is free...)
ciao,
Tito