I don't follow this, Bruce, why would they clip? Of interest, I'm currently heavily investigating the possibilities of digital rescue, and I'm finding some of the gross "distortion" mastered into releases over the last few years quite amazing: the industry has dug itself into quite a mess ...6. I know some SACD's are recorded pretty hot and any conversion to PCM will be clipped. I'd suggest keep it at 0 and if you run into any clipped files, reduce 3dB.
Frank