I use my 4,1 for music and audio, and I have put it behind a wall to eliminate noise. Problem is, my trackpad (1st gen) connects via bluetooth, and now it responds all jittery. It was great when the 4,1 was right there. I'm googling bluetooth repeaters/extenders but it not clear to me how they work, or whether they would work at all for my setup. Anybody tackled this? everymac.com says my computer has bluetooth 2.1 + EDR, but I have not yet been able to determine what protocol the trackpad uses. Since it is from 2010, I assume it would be similar.