You might want to check and see if that EV 257 has a pre-defined response curve already built-in to the software. The reason I chose the SM58 was because there was already a template for it in SpectraLAB.

I actually called up my musician friend and read him the list of built-in mic templates, and he stopped me on the SM58 and said, "oh, I've got a bunch of those".

Reminds me-- I gotta return it to him one of these days.