total noob here, need help undervolting

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http://androidforums.com – Hi Im running harmonia on s-off with jmz's kernel. My phone is underclocked but I dont really know how to undervolt. :o Can you undervolt with setcpu? On Harmonia? Or is it not possible for some reason? :confused: It may make the phone less stable, but I wanted some extra battery life Which other roms can undervolt? ps. this is my first time on the forums and Im sorry if its a dumb question or if it's been asked already. :D thanks everybody :) (General)