[Rwp] Correction from Part1 of the Superior Drummer Podcast

[Alex H.]

Hey y'all...

So while demonstrating how to add a path to the library, either
Superior Library or EZX, I mentioned that my Metal Foundry was broken
and wasn't working.

Well, it helps if I use the correct string name. Instead of
SL-MetalFoundry, it should be:
SL_Path_SL-DFH

Apparently Metal Foundry is considered the once used Drumkit from
Hell. I'm posting the correction here so it's at least documented
somewhere. I have yet to correct the podcast with this change.

Thanks much,
Alex