Wow, didn't know in modern times why anyone would use a linear pot for a master volume. Maybe BAD had trouble getting Audio taper ones, just seems weird they would launch with a linear taper. Pretty sure my Soldano HR25 has audio taper master volume pots for each channel, don't have trouble dialing in the volume for sure.
on my 1960 fender super I replaced the 500k linear taper volume pots with audio taper 500k, best thing I ever did for that amp. the later brown amps used 1meg audio taper, so even Fender learned pretty early