Using Addictive Or Sound Center??

Can you be more specific about the instrument and effect you're looking for? "Addictive Or Sound Center" offer multiple instruments.
 
Something like this?
http://www.musicradar.com/tuition/tech/how-to-create-a-classic-pitched-riser-effect-618058
 

Yes, more information required.
 
Swell as in amplitude changes or pitch changes?

Cymbal Swells :)

I use samples of real cymbals. Just plop the .wav file in the time line where I need it.

You can't beat the real thing but programming cymbal hits with a lot of notes in a short period of time with a step in velocity between each note plus a general rise and fall in the velocity pattern will create a reasonable sound. Anything you can do to kill the attack of the hits will help.
It can be done.

Grum.

arimalan
Cymbal Swells :)

http://forum.cakewalk.com/Any-suggestions-for-achieving-a-nice-cymbal-flourishswell-m3129706.aspx
 
http://forum.cakewalk.com/Slow-Gear-or-Swell-Effect-with-Gate-in-Sonar-m2201671.aspx

Something else to consider...
 
Many here still seem to like the venerable SI Drums. Maybe find some cymbals there (or in Addictive Drums, or Sound Center) and layer them. Experiment with reversing, stretching, velocity, and automating the volume.