The Azure Analog Chorus is based on the BOSS® CE-2, first released in 1979 and generally considered to be one of the best chorus pedals ever made. With only two knobs, it’s simple to operate, but it doesn’t take long to understand the wide range of sounds contained inside.
The CE-2B Bass Chorus followed almost a decade later in 1987. It was the same basic circuit as the CE-2, but with one component in the audio path changed to make it better suited for bass, as well as the addition of a Mix knob to blend in the wet signal.
The Azure is based on the original CE-2, but it includes the mix knob from the CE-2B. With the mix knob all the way up, it’s identical to the stock circuit, so this allows the intensity to be dialed back a bit while still preserving the originality. The full bass version can also be built with a single component substitution, covered in the parts list.
While the original CE-2 and CE-2B used the MN3007 BBD, the Azure can run on either the MN3007 or MN3207 (v3207) by setting some on-board jumpers. Since new BBD production has been slowed down significantly due to materials shortages, this flexibility makes it a little easier to find parts that will work.