Cubase LE4 (want to fade left to right)

Hey guys, I’m running Cubase LE4 with a Presonus Firestudio.

I have a clip of a cymbal roll and I would like to fade the cymbal roll from left to right, from speaker to speaker to get that “swoosh” sound. I have done this before but no longer remember how to, anyone got any ideas?

Any help is appreciated, I have long awaited an answer to this. Thanks a bunch!

Write then Read Pan Automation on the track.