I was able to give this a quick test whilst waiting for my tea to brew; the sound is definitely not
the same as the RE-20... BUT
, it will cut the overall size in half, so it'll do!
(A wise man once told me, sometimes good enough is good enough.
The sound reminds me of the same "problem" I have with my Vulca FM vs the TX7. The Vulca FM sounds almost too high resolution compared to the original; too clean and has none of the weird colourations.
However, as this is for live use, smaller = better, and it's a much more economical use of the RV-500, as I was only using half of it. Also, it's not like the sound is bad
-- it sounds brilliant, just different than what I am used to.
So, it looks like the refinement/evolution isn't done just yet, but I'm getting close!