is it a good idea to wipe out all the internal memory?

This way i can load what i want from the flash card? i samples some snares from phil collins on computer editing software, then saved it to the flash card, the mpc says theres not enough space on the mpc to save it? what should i do?

of course i'd copy and paste it to my computer's hard drive

You could keep them there but not load them. Try turning off autoload.

or if u wannna be ghetto just take the card out b4 u turn it on and when it on put it back in and just get what eer u want and its good to save some work on ur computer and take them off ur card.