i have a new 702 and a 64 g card, so thanks for the info! i'm also curious about the mic gain settings vs line input. is the low gain sufficient for live taping or are folks using the line in with phantom power to accomodate spl's at loud shows?
Of course, it depends on your mic output and SPLs, but if it's like the 722 (I think it's the same), you can set the mic gain to "low fades to off" and get 0 to 52dB of mic pre gain. AFAIK, it's real gain control, so very low gain means just that and there is no danger of overloading the stage so long as the meters say you are under zero.
Be aware that mic input gain control is analog and changes smoothly, whereas line level input control is digital and makes a slight zipper noise (ticking) when turned fast.