Your digital audio world is still intact … you are safe at 0db. I just finished a documentary in which there were almost 80 interviews, and it was placed in a 2-DVD case, both DVDs were dual layer DVD-9s … over 4 hours of material, and it all sounded extremely crisp and sharp … of course, all interviews were shot with a Schoeps CM4 mic, a very sweet sounding mic … so don’t sweat setting your levels at 0db. Trust your ears more than technical specifications.