Aaaah the VTC argument….here we go.
In some cases a bass can offer “warm” tone w/o the VTC. Simply leave the treble boost off, and bobs your uncle. IME, the SMX/RSD basses, for the most part, even with the Treb pot off, are bright. Too bright for many ( myself included)
The boost only config of the Sadowsky pre is genius in that……I know of no condition in which I want to REDUCE the bass freq on my bass. Never happened once in 40+ years of gigging. So, why would I need the ability to reduce the bass frequency on my instrument??… BUT, There are plenty of situations where I want to reduce the high end across multiple frequencies. This is the logic behind the VTC. It’ll warm the bass up, no matter where the freq controls are.
Other manufacturers basses with +/- control, even with the hi freq control reduced fully, you only reduce a certain frequency. Not multiple frequencies. So, for example….my Elrick has a 3 band +/- pre. But even with the hi freq control reduced fully, it still is not a warm bass. I needed to create a multi-band reduction on an EQ stomp box, to emulate the VTC.
SO, short answer……The VTC will not only warm up your bass, but it’ll give you a taste of what the higher end Sadowsky’s can do.
You will need to completely remove the entire SMX pre to install one with a VTC though, as the “VTC only” kit mod is very difficult on the newer PC board based units in the SMX models. Alternatively, swapping in of the new “fully assembled with VTC” plates are a friggin snap. Like 10 minutes…done.