I'm not sure, but there are those who are intolerant or allergic to soy but can tolerate soy oils or soy lecithin??
as for the soy sauce- go to whole foods, there is an amino-acid brand name something like that- not sure if it has soy- but anyway, wholefoods is 'used' to many allergies and intolerances and can help you...
I found this:
Most soy oil does not contain soy protein, which causes soy allergy, because the soy protein is removed during processing. Thus, soy oil generally does not cause allergy symptoms. However, those with soy allergies should check with their physician about consuming products containing soy oil or processed with soy oil.)
from here:
http://www.lpch.org/diseaseHealthInfo/HealthLibrary/aller...
good luck!