For example, you can throw in.....audio files? Ofcourse there are also ways to record whatever you listens to (spotify, youtube) over to Ableton and therefor also in the Sampler. I guess you were thinking of sampling on the fly? Well, as long as your computer and/or your audio-interface is set up correctly, you can sample most audio from the computer.
I'm not sure if I am advising you to fiddle around in ableton live alot more before you start with your new push 2, but certainly check out the manual and tutorials on youtube to get the basics on how live works. Remember it's just a midi-controller, therefor learn the Live DAW and it's possibilities
