Electro-Harmonix Bi-Filter Analog Dual Envelope Follower Mind-blowing filter effects tweakable in real time! Analog, dual envelope follower utilizing multimode filters and myriad of state-of-the-art features. There is nothing on the market that can match its tone. The outputs of each filter are available separately as well as mixed with the input signal in the main output. An effects loop allows insertion of the external effects before the filters, after the envelope detection circuit
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