For those into keyboards/ synths with PC's
 

If you have yet to already I advise you look up VST plugins and get a program such as Psycle. Basically it turns your computer into a synth, or whatever else you want it to. Some fun stuff to mess around with and most of it is free.

I prefer the hardware stuff ;) Brought a laptop with my once on stage... crashed, Blue screen of death, embarrassing all over... wasn't a Mac though..