can I double check that with you...
you don't mean the pilot should partially close his twist grip do you?
I think you must mean(?): "....and the correlator will close the throttle (butterfly valve) by the appropriate amount - reducing the torque but leaving the RRPM unaffected." ???
AnFI,
Yes, that is exactly what I mean. In an LTE situation, RPM must be maintained, but power reduced.
Lower the collective, and maintain RPM.
Someone else might chip in more, but that's how I learnt it.