A friend of mine had an RH4, it played great, sounded great too. Had some weird trem, looked like a stock fender classic trem that was flat against the body, so stayed in tune doing country style bends etc or string breakage... but you could still pull up on the arm to raise the pitch. I bought one shortly after trying his, but the neck was totally different, very thin and flat compared to his. So i sold it.
The little active switch was pretty cool, mid position was off, up boosted the treble and bass while cutting the mids, down boosted the mids. There were some trim pots in the battery cavity to fine tune the active eq
