Now I'm wondering what to go for if I ever get off my duff and try to build myself a 3-string... Maybe I'll just take the G off one of my 4's and see where that leads me.
Two of my more recent finds are 24 fret 4-strings and it's occurring to me how they change the equation up at the crossroads with the body (both are bolt-on's). Both basses have two pickups and the extra length on the fingerboard runs that end of the board up closer to the neck pickup than something like a traditional Jazz with maybe 20 frets.
What's caught my attention is that the extra fret board seems to create a fundamentally different tone from the string when I slap a little bit. I'm certainly not comparing two nearly identical basses with different numbers of frets here, but it seems that when I slap the string against a 24 fret neck, I'm knocking the string down against the frets at a different spot - effectively a little closer to the bridge - than on a 20 fret bass. Maybe a little less belly and a little more mid-range in that fundamental tone from a slapped string on a 24?
No biggie there, but it could be similar to how we can get different tones when plucking a string closer to the neck or the bridge. When I got these basses, it didn't even occur to me that they had "extra" frets. They were both really neat builds that would have come home with me even if they had only 12 or 15, but I guess I'll vote the 20-21 slot.