I personally dn't use limitedsharpen anymore. I've found using blinddehalo3 and unfilter delivers a nicer looking result and is less of a resource hog too.

don't get me wrong, it's good, but to make it time effective you need a bit of oomph behind it to make it work well. it does a lot of resizing and supersampling you see.

I generally got good results with this

LimitedSharpen(ss_x=1.5,ss_y=1.5,Smode=3,overshoot=3,special=true,strength=125)

more strength than that produced some nasty artifacting.

go to this threaddoom 9 forum limitedsharpen thread

and it spells out what you need as regards dll's