MIDI Setting Cancelling Note Events

I'm using ver. 8.5.3 with my Alesis Fusion 8HD. I keep hearing that kind of slight "flam" effect that you hear when 2 note events occur right on top of each other, or maybe when 1 event is being transmitted, and the other is incoming. So, while I'm going to post this on the Alesis site, but I want to make sure that I have all of my MIDI settings correct to prevent this phenom. I've been doing MIDI since '88, but I can't see what's causing this. Tanx, KC

That'd be my first guess, too. Although it's also possible the controller has problems such as dirty switch contacts under the keys causing them to bounce. That's much less likely, but I have seen it happen. Borrowing someone else's keyboard for a test would tell you.