Volume normalization between phono preamp and A/DC

In order to maximize the dynamic range of the encoded material it would be best to be able to manually adjust the level between the phono preamp and the A/D converter. And I don't mean a gross adjustment like a trim level, I mean a manual fine adjustment. Does anyone know of a good way to do this? For instance, is there any high quality phono preamp with a manually adjustable output level?