The ER-301 might have a bunch of filters, but there's something to be said for analog filters that digital filters don't do that well. I know, I know, I know that's the cliche thing about analog v. digital, but if there's one analog vs. digital comparison that's absolutely true, to my ears, it's this one. I went through with my friend's ER-301 and we went through the filters and it was really apparent. That being said, I would totally use the 301 to make a fixed filter bank if it were easily possible.
Also, Behndy, I haven't forgotten to message you about the 101/102 combo.