Right, couldn't be bothered trying to find IR LEDs so I'm using some red ones, however the wiring is the same.
If you look at the picture below black is for negative and red positive, proving that for once I can follow convention. For the LEDs the black leads go to the short leg and the red leads got to the long leg, this is basically the only bit you can get wrong but if you do it won't work.
You'll also see I didn't bother with any of the current limiting resistors that the Freetrack guide recommends using, if you want to use them they go between the red lead and the long leg of the LED. Basically they'll prolong component life, there might be a safety aspect as well vis overheating but it's a risk I'm willing/drunk enough to take.
This is with power applied, I'm only using two 1.5v AA batteries as that's more than enough for the LEDs I'm using as they only need about 1.6v. I'm only using an 8 cell holder because it was lying around. You wouldn't believe the crap I have lying around I found a DVD player I didn't know I had the other day and I've a sneaky suspicion I could build two more computers with the parts I've got in the back of my wardroom, it's like Narnia in there just with more motherboards and less fawns....
I suppose I should see if I can get it to work with the Freetrack software now...