Vanilla Ardour Plugins in Mixbus
Ok, if you miss in Mixbus the plugins that came with the Mac OS X Ardour package, I have found a simple solution, assuming that you have both packages loaded.
Make sure that neither application is running. Also note that while this worked fine for me, your mileage may vary, and, if you break it, you keep it, and it's not my fault... :-) Here's how I did it.
In my case, Ardour and Mixbus are in the regular Applications folder, so I opened the Applications folder in Finder, single-clicked then right clicked on Ardour, then selected "Show Package Contents." This brought up a Finder with a single folder, "Contents". I double clicked "Contents."
I then did the same sequence as above with Mixbus.
So I then had two Finders open. In the one for Ardour, I right clicked the Plugins folder, and selected Copy "Plugins". I pulled up the Finder for Mixbus, made sure I was in the Content folder, right clicked in the blank area, and then selected Paste Item. A dialog asked if I wanted to replace the existing Plugins. Once I was sure, I clicked Replace.
The next time I started Mixbus, the CAP, TAP, CMT, and other plugins I use very often were in their places and worked just fine.