With the FP24, are you using the 1/8" tape out into the 1/8" input of the DR-70D, or are you using the XLR line outs of the FP24 to XLR inputs? I am wondering if the XLR inputs handle the hot (+4) line outputs of pro gear like the FP24. The manual has no info on things like this, and none of the reviews I've read have any sort of thorough measurements. If I get one of these, I would probably keep using my FP24 as well.
Also wondering if phantom power is an all-or-nothing affair or it is switchable per input, as the screen image in the manual seems to imply, but again I cannot find anywhere where this is stated explicitly.