Sorry I didn't see this earlier. The 12V connects to the fourth "leg" on the QuickSilver CPU module. Basically, once you screw down the QuickSilver CPU module on a Digital Audio, you'll notice that only three of the posts will make contact with the daughtercard. Where the 4th post is on the QuickSilver, there is no post on the DA. This 4th post carries 12V from the motherboard to the daughtercard.

So to add the extra 12V, you must tap a 12V line from the PSU such as one of the yellow hard drive power cables. I use a short bolt and nut through the fourth hole on the CPU module and either fasten the bare wire directly to this or use one of those fancy electical connection pieces that crimp onto the end of the wire and add a little washer that you can place under the bolt.

I hope that's the information you need. If not, I'll see about taking some pictures of it.

Peace,
Drew
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Power to the PowerPC!