Greer Amps Royal Velvet Class-A British Overdrive And Preamp Effect PedalBritish chime with a little Greer Amps grit. For some, this may seem like a massive undertaking. For others, they know the Greer Amps Royal Velvet exists. This unique drive and preamp pedal combines the amp tones of British valves and Greer Thunderbolts into one hybrid that makes its own name for itself. Voiced to be reminiscent of "AC" style British amps, the folks at Greer have developed a unique transformer that stays faithful to the sound while