I just heard back from Nick at Rogue. The RP-1 and the RP-5 Both invert phase on ALL inputs (including phono).
So Rogue told you the RP1 inverts both line and phono, but JA's measurements in Stereophile showed that the phono does not invert? Seems odd to have a manufacturer give you the wrong specs.although phono stage preserved absolute polarity and line inputs stage inverted absolute polarity, the preamp output still inverted absolute polarity!