Red Witch is a small company from New Zealand (I’m also a big, big fan of Audio Crowther that is from New Zealand as well) that specializes in analog guitar effects.
Here is a brief description of the Empress Analog Chorus:
The Red Witch Empress Chorus is not just an ordinary analog Chorus and Vibe effects pedal. The most enticing feature on the Empress Chorus pedal is the unique voicing control. This dial accesses virtually any chorus sound you could desire. It changes the delay time—it’s on a pot so you’ve got an infinite number of chorus pedals in one box—from super spanky sparkling clean to noisy, seasick-inducing, pitch bending wobble.
Delay time determines a big part of any chorus pedal’s tone, flavor, and sound. Short delay creates a very pristine, airy chorus, whereas longer delay time gives more wobble and throb. Unfortunately virtually all chorus devices only have 1 fixed delay setting—or at most a choice of 2.
Red Witch designed a circuit that adjusts the delay time via a potentiometer—from one extreme to the other and everything in-between. In its most extreme settings the device produces some hiss—this would be expected within the last third of the voicing controls sweep.
I found a nice video by soundpurestudios where they describe the pedal in detail:
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