Hello Beaver,
Well, you know me and I purchased my first two Warwicks before starting to work for Warwick from you. I've had a chance to actually play every single instrument on the regular production at this time. About those two that you are asking about, here are my thoughts.
Corvette Bolt-On (Corvette Standard):
The solid Bubinga body, combined with the Ovangkol neck gives you a very midrangy bass, but in my opinion it lacks some low end (the stuff that goes below 60Hz). This happens because both of those woods are very hard and dense, therefore they tend to act as traps for some of those frequencies, which is not bad when you are looking for presence in your tone and you need to cut through.
Corvette NT (Bubinga):
There are two versions of the Corvette NT, one of them being made out of Bubinga with a maple neck. This is a whole different deal than the Corvette Standard for a few reasons. The first one being the maple neck, Which doesn't give you a lot of midrange, but gives you very bright highs and focused lows. The Bubinga takes care of the rest. Then there is the Neck-Through construction, which allows the body and the neck to vibrate for a longer time when the strings are plucked, making it have a lot more sustain than the bolt-on version. When it comes to electronics, I consider the $$ NT a lot more versatile than the Corvette Standard, starting off with the two passive humbuckers which will give you an extremely hot output, and you can switch each one independently, allowing for incredible amounts of control. First you choose a basic sound and then you can shape it however you want using the 3-way electronics to kill or boost whichever frequencies you think will make your tone suit the music you are playing.
Corvette NT (Ash):
The Corvette NT's other version has an Ash body, which less dense than Bubinga, therefore allowing for a more open low end (it's not as tight and compressed as the Bubinga version) but for someone that plays hard rock or metal, this is certainly and advantage. Maybe not so much for someone playing funk.
So to finish it off, I think I would say that what happens is basically that the NT is a brighter bass overall with better sustain, while the other one is a little darker.
