Hey, newbie here.... just received my new Mikro Mk3 and just went through the quick-start tutorial. Seems that my pad #4 isn't triggering any sounds. It lights up, and all the other pads play sounds, but this pad is silent whenever I tap it. I'm hoping I just did some newbie thing like muting it or something, and that it's not a factory defect. Anyone else experience something like this? Thanks!