I stand corrected as to the R-09. I just tested again and couldn't hear a problem. The manual warns of a problem, but if there is one, it seems to be negligible.
The R-09HR, however, sounds awful where you are changing the gain. You can just record your voice with the built ins and hear how bad it sounds. Not a problem in practice ffor me, though, as I usually change gain with a pre and leave the HR at unity gain.