Okay yes it looks like he does use the dirt node, and I was able to connect the first AO node to it, but the second one won't connect even if I try connecting it backwards
You mean he explains it after that? Well I guess I should have finished the video before I asked - doh! Thank you so much for your help! I didn't know that about FX maps. Only thing is, combining the AO nodes into a blend node doesn't work, because the AO node won't connect