I just got the Accountant and Barbershop this morning, been trying with passive precision and jazz bass, comparing with the Broughton Scorpion Overdrive. The chain is guitar>Broughton Buffer>compressor>drive>Broughton HPF/LPF>Traynor amplifiers/cabinets.
The Scorpion has a lot of tones to it, very interactive dials. The Fairfields are much simpler, each has sort of a baked in tone. But that’s the tone I want, the dark, dirty, gritty, punchy vintage tone. The Scorpion goes to a lot of places but has trouble getting to this one.
The Accountant can be clean, even both switches at two is very useable. I like its tones a lot. The Barbershop I ran at 9V and 18V. The effect is subtle at 9V, even more so at 18V even with Drive dimed and Sag dialled off. The Tone switch is very, very useful. When pushed to their limits, the Accountant sounds nicer, sort of.
Some have suggested the Accountant makes the Barbershop redundant, which makes sense in theory. But in practice, the Barbershop adds something to the Accountant, sort of rounds it out or fills it out, hard to describe, they sort of blend together.
For this vintage tone, I also use the SolidGoldFX BetaV (with its stablemate the Diamond Bass Comp/EQ) which can be very dark but punchy and articulate, with or without drive tones.