Code Red Free is inspired by a classic, all tube, British console form the late 60s. The original console was known for its EQ, bold and punchy character, and the warmth it imparted. The Beatles recorded most of their material using this, and other versions of this console. Easily recognized overdriven sound of the Beatles' Revolution was created by chaining two preamps from this console.

Shattered Glass Audio has gone to considerable lengths to find accurate information and reproduce the original EQ curves and accurately model the preamp.