It will take a little auditioning. The most recent prototype I sent to Tony was intentionally dialed back so even with a 12AX7 in place it doesn't overdrive, but there will also be a second channel/boost function that will be capable of overdriving the main preamp. So the intention of the product will be a standalone preamp, but I understand that some people's definition of "clean" involves having some grit/grind on tap, so we want to be able to provide both. But this is most definitely not an overdrive, and is not designed to be high-gain.
Neither

Fender and Baxandall are both passive tonestacks, whereas this will be my first ever active-EQ preamp. The best description I can give while remaining intentionally vague (see brad's comment) is that the knobs react intuitively. I'm really happy with what me and @TonyP- settled on with the EQ, it feels really nice. Like you probably have some idea in your mind about what "hi-mid" and "lo-mid" mean, and turning those knobs feels like your brain expects them to, same obviously with bass and treble. I really like it. Passive tonestacks certainly have their place and are significantly easier to design, but the main complaint people typically have with them is that it's hard to really boost with a passive tonestack, especially in the mids. This was a point @smeet brought up earlier, both the Fender and Hiwatt stacks have a mids control, but it's cut only, you get the mids knob all the way up and you're stuck, you can't add more mids than are already there. An active EQ allows you to boost beyond unity.
Well put

Tony had some ideas of what he wanted this to sound like, and I was able to take his ideas and put a sushi spin on it. I can say it's not anything you can find exactly anywhere, which is why Tony came to me, but it certainly draws inspiration from fabulous things that are out there and will not be, due to professional obligations, mentioned by name.