Jake, your diagram shows the Vcc pins from the sound board and the arduino connected. yet you have both units receiving raw power as well. The Ardunio pro mini has an integrated regulator to take up to 12v of unregulated power. And they recomend to use the Vcc pin only if you have regulated power. and you do have a v regulator in your specs, not on the diagram tho. So,.. What gives? why connect the Vcc AND the raw inputs? And also why short the Vcc's tween the 2 units? What model N MOSFETs di you use to drive your LEDs? please and thanks!