I ran across a wood hand call a long while back a guy was making that really sounded great, as in, I was really impressed. It was an enclosed reed call, but you wouldn't have known it. It had the bark/whistle sound that was great. Bad part is...I don't remember who it was and I cant find it now.
Fox vocals,,I've used enclosed reeds for gray fox forever, and hacked up diaphragm turkey calls for 20 years for greys, and have called up numerous reds as well, although the frams are super for it, a hand call tuned right will do lots of damage.
Here in Kalifornia, we cant use Ecalls for fox so we've had to get creative.
Mark