Java SE (Java Platform, Standard Edition)

I am writing a program that creates a midi file as output. This midifile can then be loaded into a sequencer and viewed as music notation.

The problem is that would like to know how to implement a meter change (ie time signature)

Can someone send me an example of some code that does this? I've ready the Sun java reference page extensively as well as many many other web pages, and all stop short of this topic.

Thanks