Does anyone know of a good external intervalometer for the dvx/hvx? I want to be able to control:

Frame rate (from 1 frame per hour to ~6fps)
Shutter speed (for time-lapse + interval effects)
Ramp controller

Something like the Arri RCU-1:

http://www.arri.com/prod/cam/rcu/rcu.htm

Am I dreamin' or does such a tool exist?