I am currently obsessed with the track by Celldweller called "Last Firstborn". Is there any name for the keyboard technique used in the chorus?
In this YouTube video you can hear it from 1:28 right until 1:57:
Edit: If it's not some particular technique with keyboard itself, then it has to be some synthesizer effect (it's an 50/50 electronic music after all) and identifying its name will be sufficient to.