What to do with unused pins on CD4049 or CD40106???

[richon]

What to do with unused pins on CD4049 or CD40106???

connect them to ground or +V??

should the input be to some of them connected and the output not connected (when not used?)

[slacker]

Yes you just connect the unused inputs to ground or +V, it does not matter which. You can just leave the outputs unconnected.

[edvard]

Or you can put them to good use.
Use a few of the other stages to make a "second channel" a la the DoubleD:
http://www.runoffgroove.com/doubled.html

If you're into solid-state switching, you can use two of the inverters in a DOD-style flip-flop:
http://hammer.ampage.org/files/dodswitch.gif

Dang, that's all my ideas.
HTH...