I try to follow the Ashkenazi tradition as best I can during Passover, which means no rice or beans (in addition to the no grains/corn/etc. thing). Since I'm pretty sure this covers soy products as well, what about soy lecithin when used as an emulsifier? Is that also considered chametz?
I know it would be easier just to buy only things certified kosher for Passover, but I don't like to get charged an arm & a leg for basic things.