Question Are there any undocumented ClassicVerb Controls

Indeed there are:
  • To access the pop-up menu for 'Room Type', right click (or control click) on the 'Room Type' parameter with the mouse.
  • Due to the complex relationship between the various room types and decay time, it is not possible to display decay times using time values, as described in the manual. "Decay Length" is used instead, where lower values equal shorter decay times.
  • Since the time we wrote the manual, a new Room Type has been added. FX SAUCE is a room offering an extremely long decay time and is intended to be used as an effect, and not a true room simulation.