I like to modify things on vero because it's much more forgiving of changing parts than PCBs tend to be. And there's also the fact that PedalPCB are out of Gauss Drive PCBs right now... BTW this circuit is a bugger to draw a good vero for.
So last night I drew one up of a modified BB/Gauss Drive. I used elements of both. I used 100µF and a 47µF as filters, a 1K5 to bass 3 in the tone stack rather than the 4K7 in the original, different diodes and an A500K gain pot instead of B1M. Findings? Well it's too late now to really crank it, but there is definitely more bass on tap which affects the way we perceive the midrange. Compared to my previously modified pedal it's even less boxy sounding and more natural - whether this will stand up at better volume levels I will see tomorrow, but it's looking promising. I might go to an A1M gain pot as I'm not sure about this A500K. I know I like the pairs of diodes better than single diodes, and the 1N4001/1N4148 pair is not a huge change from four 1N4148s. Pretty sure I used 2SC1815s in the first one but this one has 2N5088s. I wonder if that has any impact? I used 470K to Vref for the Base rather than the 510K the Gauss Drive uses for the 2SC1815s, as that's how it was (apparently) done in the BB.
I always felt that the BB was nearly a great pedal - maybe one or two tweaks is all it takes to make it great for me.
Let me know if anyone wants to see the Vero layout.