I'm in the process of making a modded version of the Budokai HD that has the OST's of the original two games. I know how to do it (swap the .afs files in the iso). Changing Budokai 3 was very easy because the files's names matched one-to-one. But I'm having trouble with Budokai 1's OST because the file names don't match.
For those that have done this, you know that you simply need to swap the .afs files (and then upload the iso with the updated files onto your PS3's hard drive). This is shown in the photo below. The left Finder Window is the Budokai HD files; the right Finder Window is the two audio files from the original Budokai 1. As you can see, there are no corresponding ADX_US and DATA_US in the HD Collection.
So where do I go from here? (I've actually done this process before and succeeded, and so I know this is possible, but it was for someone else and thus I don't have access to the files anymore).