Not surprised Mayer was using a Blaster (I still kinda prefer “Stratoblaster” … great product, great name!). As I recall, he was playing a Further prior to becoming an endorsee for PRS. I had an early black plastic Stratoblaster in my ‘61 Strat for years, set at about unity gain, always on. Really filled out the tone. I only took it out when pre-CBS Strats started going through the roof and I no longer felt comfortable taking the guitar out, so I put it back to stock (along with removing the brass nut and saddles). Like a lot of Alembic’s designs, the Blaster is a simple, yet VERY effective, little bugger!
Bill, tgo