My girlfriend offered to me six years ago and I had no time to test it since!
I'm afraid it's a too basic question but I've tried a thousand times and I still haven't found the way to chance the metronome's tempo in music studio 2003
The product is 6 (!!!!) years old. Honestly and with respect: If you want to invest time to try out this product, download the trial of Music Studio 16 (2009) from the magix.com website. It is 30 days free with full function.
You will run in problems with Vista or XP anyway with a 6 years old version.
If you change the basic speed (click on the BPM) you will change of course also the metronom.