There's lots of stuff out there for those who don't want to record their own:

Here's a couple of Kontakt sets from www.sampleism.com , all sampled at multiple velocities and with round-robin alternate samples, making for very playable instruments.

Pot Lid : a nice melodic hit of a pot lid[ (£4.00 ...

It depends on what you like to play.

If you want to play piano, then its probably pretty much a given you'll want a weighted controller. There's really no substitute for that feel. I really like having an 88-key controller for live electronic music because I can map different things to different ...

OK so I'm having basically the same problem, except that the volume is so extremely low that it is almost inaudible. The db is set at zero, and all that jazz. I can't figure out how to fix it. Any ideas as to what could be wrong??
Try hitting the "play" button in the "looping editor" pane - this ...