Sorry, didn't mean to be harsh. Just wanted to correct your misconception.
lmichelutti:All I know is that all of my tuning pedals require the setting to be put at A442 when I'm tuning to E-flat.
This, I don't know what to make of. Can you explain? Setting your tuning pedal to A442 simply calibrates the overall target pitch at two cycles sharp of normal. The option is there because certain instruments (usually woodwinds) are scaled/optimized for a target pitch of A442, which is the European standard (I think). It could be that whatever you're trying to tune (in E-flat or any other key) is one of those instruments. A little websurfing seems to indicate that a lot of harmonicas are made that way -- although I must say that seems rather odd, given the tendency of an overblown blues harp to go sharp, not flat.
Immitation is the best form of flatery.