FX effects, WAV

I have two questions. Number one, the fx effects on the third tab of beatmaker. I know I can change the effects of the beat Im currently making, but is their anyway to take a single pattern, like a bass patern for example, and just change that? This way I can just play the song without having to add effects during while it's playing. And also, does anyone know where I could find a decent WAV site that I could download WAVs for free, or where I can get kits like a piano kit?

Thanks