At the 3:50 mark the line that he plays on the Nano does sound out of tune compared to the same line played on the Micro at about 4:14. It hit my ears in a very funny way immediately. It could be the circuit, or it could be that he does a better job of muting unwanted string vibrations on his second pass. Hard to say, but I definitely agree with you in that clip.
Regardless, I want a Nano with separate up and down footswitches. As an all-on or all-off switch I won't be buying one. If JHS does something similar to the QuadraPog with this new Nano, I'll definitely give it a shot.