VDQ : terminal transparency/opacity??

[Beartooth]

	I set the degree of transparency for my mate-terminal, but then I 
changed the background, and now I can't find the place again where I can 
adjust the opacity again. (I *think* that place called it transparency 
rather than opacity.)

	Clue, please? TIA!

-- 
Beartooth Staffwright, Not Quite Clueless Power User
Remember I know little (precious little!) of where up is.