You might be interested in this:
http://www.soundscapehifi.com/expressimo.htm#LIFT
It takes a bit of tweaking but it does work well. It can't turn off the motor, though! Good luck in your search.
http://www.soundscapehifi.com/expressimo.htm#LIFT
It takes a bit of tweaking but it does work well. It can't turn off the motor, though! Good luck in your search.