[LAU] Ardour 3 and reusing sessions

Hi all, In Ardour2, I used to copy my existing session into a new directory, hack the ardour files to change the directory names and then drop in the recordings to make the podcast releases a lot easier. In Ardour3 when I do the same trick, the session looks OK but the audio content is missing. The regions are visible but with no waveform (and audio when I hit the play button). I hacked the ardour file & the instant.xml file as well as the interchange contents. All that changes is the episode number (i.e., epXX to epXY so a quick search & replace used to work in Ardour 2). Template only saves the tracks etc., not the audio files. I already have the intro & outro etc. with automation. All I want is the middle bit of the podcast replaced with the latest version. I don't want to reuse the existing session since I usually do a number of recordings and then prepare them, put it into the can and wait until it's time to upload. I might have to go back and redo something quickly so I'd rather have a pile of sessions sitting on disk. How does this supposed to work? :-) Cheers, Hakan