Plugins?

Is there no way to dynamically link to libraries after initial runtime?

I see no way of really adding plugin/addon support to an application without this. DLL's have to be in a specific spot location when an application is executed, rather then being able to load/link to them at any time.

Any clues on getting something like this going?

Yes, you can use LoadLibrary().

So, for example, I can modifty your bass.mod and have it load the library by function prior to initializing the audio engine? Therefore, I would be able to compile and run the app without the dll in the folder, but could load it at anytime?

You would have to change all the hardcoded functions to load dynamically instead. Kind of like how the OpenAL module does things.

Sounds like an interesting option though: Not having to bundle the DLL, but if it's desired you could drop in the DLL and enable the functionality.