Satoshi, I was referring to this video where Konami-enhanced audio is not supported by the PokeFamiDX, at the ten minute mark:
http://www.youtube.com/watch?v=-Xz66T_I0Lk
Listen to Lagrange Point, especially. Not a big deal, I guess.
One thing I don't get is why can the NES adapter that comes with the RDP be used only with the RDP?