Kernel modules?

[bxwen]

First thank Merlin for all the work.

I was using tomatoUSB on a RT-N16. I set up MPD following this instruction
http://blog.qnology.com/2012/12/tutorial-apple-airplay-on-tomatousb.html

The key is to have some extra kernel modules so that sound cards can be recognized.

Now I am migrating to an AC68U with Merlin firmware. There is a big speed boost. However I can't find those kernel modules anymore. How can I find the modules, or is there some kind of tutorial to build them?

Thanks again.