My mixer is triggering midi keyboard
I'm not sure what changed and what caused this to start happening, but for some reason my mixer is triggering sounds from my keyboard (which has a built in speaker). For example, when I press "Play" or "Stop" or anything else on my mixer, it triggers my keyboard to play a certain note. It's almost like they're are synced in a way which I could actually play the keyboard (poorly) through my mixer. But I don't want this to be happening at all. How can I fix this?
Logic Pro, Mac OS X (10.7.3)