There is an excellent "per-dot" chart of all the tone control frequency centers somewhere in the RH450 thread. One of the TBers calculated it, and TCE confirmed that they were correct. If you have trouble finding it, I can scan and email a copy.
It helped me think through the tone control settings I'm using for my RH750 (which I'm really happy with).
+1 That chart was based on the formula I posted here (it is in the 'RH450 favorite settings thread'. It works for the RH450 and I assume the 750.
We never really could figure out what was going on with the Staccato though, since the minimum and maximum of each range does not seem to bracket the 'per octave' doubling that you would expect.


. And hereby I too will return to business as usual