Marty, sorry for being slow here but do you mean that when there's no jack plug in the jack socket the input should be grounded to both the metal case AND the circuit ground?
Should the metal case normally be connected to the circuit ground in any effect that I build?
There are a number of ways to wire "ground" - the more complex ones apply when building a PSU
or higher voltage device such as a valve amp etc, but for general 9v "stompers" I have a ground rail
on the circuit, which I connect with wire to both in and out jack's ground point - sleeve of the jacks.
In and out from circuit/switch go to the tip of the jack socket and for power switching, your negative
battery lead connects to the stereo input socket's "ring", so power only flows when a jack is inserted
into the input jack - just like most commercial pedals.
The Jack sockets will have their ground "sleeve" connected when screwed to a metal enclosure, which
provides a good large ground plane and should keep noise down.
Search for more on this or see the DIY FAQ above

MM.