Worm gearbox for hobby servo?

Hi Guys.
Thanks for the replies.
What I’m trying to do can be seen in this post (5th post down)

Nexisnet, we talked about this in the above mentioned post.
So a digital servo holds it’s place and does not backtrack when the signal is removed and the power is on. That’s great, no signal - no feedback= no chattering. I can leave the power on and stop the control signal.
Does a digital servo need a special type of controller or the same type as the analog servo?