The JoshWah is an envelope filter (auto-wah) with a gain stage on the input for increased harmonics and envelope detection. It uses a resonant low pass filter for fast up-sweeps. 

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Review by Bass Musician Mag

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Demo by Zachary Rizer

JoshWah

The Parametric Equalizer offers three bands of equalization with independent control of frequency, bandwidth, and level for each band.

Each band has up to 15 dB of boost or cut. The bandwidth ranges from 0.25 to 2.5 octaves. 
Low - 40 to 400 Hz
Mid - 200 to 2,000 Hz
High - 1,000 to 10,000 Hz

Parametric Equalizer

The Super Stack is a tube boost with a Fender tone stack EQ. The new production JJ 12AX7 tube is powered by an internal high voltage charge pump, giving the same gain and response as that found in many classic amps.

The EQ is an exact recreation of the Fender tone stack with Mids. It is also the same as the Alembic F2B.

Super Stack

The Fliptop is a JFET preamplifier that is modeled after the B15 amplifier. The gain staging and EQ sections were carefully designed to give the feel and response of the vintage tube amp, offering a good range of pillowy tone that can be driven to the point of light overdrive if pushed.

 In addition to the James stack EQ and gain staging, the Fliptop adds a Master volume control on the output so you can dial in the amount of drive you want while adjusting the volume as needed.

 The Cab knob is essentially a wet/dry control, allowing you to apply 0 to 100% of the cab tone to the preamplifier output. Dialing in more of the cab response tightens the low end and cuts the high frequencies for a warm, vintage tone. The frequency response is modelled after the 15" cab.

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Low + High Pass Filter

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JoshWah

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