I've searched around for this info but haven't had any luck finding it. I'm looking into getting a 4 string NT thumb and was wondering about a few things. What is the difference in sound between the older wenge/bubinga necks and the newer ovangkol/bubinga necks? When did they switch the electronics and the nut? I want the newer electronics but would prefer having the brass nut. How much would it cost to have the nut switched if need be? Thank you. Any other info you have is also appreciated.