Better metronome for GarageBand?

choose a sound you like from a drum kit. theres many to choose from in the higher notes. record a loop of the count you wish as a software instrument track. edit the midi velocity to create accent on one and drag it out for ever how many measures u need. save the loop and everytime you create a song add it as a track first. that should work until you find a plug in.

What Silenced one suggests is the way to go. If you'd like to read a tutorial on creating "Click Tracks" (which is what you want), read this:

http://www.bulletsandbones.com/GB/Tutorials.html#allaboutclicktracks