Zuki......I have many times made substandard sounding KB's workable in the past .....yes some take many more man hours to accomplish but not impossible to reach my goals.......some I knew after a few days of very vigorous tweaking that it wouldn't work out but I always give it a few days of in tenseness....there is a threshold that once it its is superseded I have no alternative but to relinquish the product & move on. But there is one thing I always do .....& that is to Gig the unit a few time to at least Always RECOOP my cash outlay so that if I lose a few bucks off my buying price when I resell it I certainly have it made in gigging fees first so my INVESTMENT always is never a loss

Good Luck.