We do a couple of shoots with the SD 664. We don't run audio back to cam and just synch in post. Almost always a boom + 1-2 lavs. Wondering if it makes more sense to have the ISOs set to prefade or postfade. Postfade makes more sense to me (otherwise, what's the point of adjusting the faders?) but someone recommended prefade. Hoping to clear the issue up. Thanks for your advice!!!