Reply to Sample decks with 2.5 & VCI400 EGE?

I need to get basic sample deck functionality working with Traktor 2.5 and VCI-400 EGE. Right now, pressing the sample buttons is extremely wonky to say the least, you know what I mean if you've tried it. I just want to get these buttons working to trigger horns & sweeps for my set. Can anyone help?