Thank you for your reply Steven,
I hope the tool is helping me.
Unfortunatly this is not helping me with the sound referenz problem. The merged clips I have created even imply the original Source TC(which I can control in the TC overlays) but if I want to trace back to the original clips its not possible as soon as I merge the clips. As long as I leave the synchronized clip unmerged in the timeline I can match back to both picture and sound. But if I drag it from there into the browser, the referenz to the soundfile is gone. And it is not possible to output an EDL including the soundclips.
So I am doubting that I am still on the save side just in case my disk gets on fire and my project is offline.