Bit Of Gold, Bit Of Black, Bit Of British Amp Tones
The term Marshall In A Box was coined for pedals such as the El Rey Dorado as that's basically what they are! This particular pedal was sculpted to sound like a specific Marshall 45/100 reissue which sounded so good Keeley considered it to be the quintessential Marshall tone!
Low Power mode has less compression and therefore is louder, it has more girth and fewer harmonics which provides a more old-school tone. The High Power mode in contrast has more compression so less volume but more drive, harmonics, and a tighter, more defined tone. Old-school crunch in Low Power mode, super lead tones in the High Power mode just how Jim intended.