Electro Harmonix Bi Filter Analog Dual Envelope Follower

Multi-mode filters and an all-analog signal path pumps up your sound with the world's fattest, sweetest filter power.

Two separate filter sections can be used in serial or parallel with different tonal sweeps, which react individually or interactively. Phase control allows for further contouring. Individual outputs for each filter plus a mixed output. In addition an external CV in or Expression Pedal in for controlling the filters with external devices, footswitch pedal input and two CV outputs enable audio triggering from each filter.

Specifications

• True bypass using a mechanical relay
• All analog processing
• Dual 2-pole resonant filters
• Each filter completely independent from the other
• Switchable filter type for each filter: lowpass, bandpass or highpass
• Accurate envelope follower section using a precision full-wave rectifier circuit with optional log control
• Dual attack and decay adjustability for the envelopes each filter
• LFO with switchable triangle or square wave shape
• LFO duty cycle adjustable from 0 to 100% or from up sawtooth to down sawtooth
• Switchable FX Loop section allows user to apply effects to the signal before the filters while retaining the instrument's original dynamics
• FX Loop section also allows the envelope of one instrument to sweep the filters acting on another instrument
• Independent outputs of each filter
• Mixer section allows user to mix the filter outputs with the dry signal as well as invert each filter
• CV/expression pedal inputs for each filter, controlling the center frequency of the respective filter
• CV outs output each filter's envelope section
• 18VAC-1000 power supply included