The Cerulean Amp Overdrive is an updated version of the Marshall Bluesbreaker pedal, in production from 1991 to 1999. A legend in its own right, it was also the source circuit for a number of expensive boutique pedals, most notably the Analogman King of Tone, which is two Bluesbreakers in the same box with a few modifications.

In 1995, Marshall moved production from England to Korea, and around this time they made some tweaks to the circuit, increasing the gain and reducing the bass. The Cerulean project has a switch to go between both modes so you can hear the differences. It also borrows the expanded clipping options from the King of Tone, allowing you to select either soft clipping (stock), hard clipping, or no clipping (boost mode).

Demo by  Jeffrey Richard

Demo by R.J. Ronquillo

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Cerulean Amp Overdrive / Marshall Bluesbreaker 

The Lumin project is a workalike of the BBE® Sonic Stomp / Sonic Maximizer. It’s based on work done by Bajaman (documented on FSB)[1] and Sebastian Montti (stm) on DIYStompboxes in recreating the functionality of BBE’s proprietary NJM2150AD chip.[2]
The BBE 482i Sonic Maximizer rack unit first appeared on the scene in the late 1980s and quickly achieved legendary status among sound engineers for the way it imparted clarity on the signal—often described as sounding like a blanket was lifted off the speaker cabinet. The circuit is said to create “frequency-dependent time alignment” so that the audio frequencies hit the speaker in a more optimal way. Many professional audio setups even outside the music industry utilize the “BBE process” to enhance sound quality.

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Lumin

A part-for-part replica of a mythical overdrive effect noted for its high-end tone and price. The Klon Centaur and its successor, the KTR, remain highly original designs in an industry full of clones and tweaks to existing circuits.

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