Electro-Harmonix Bi-Filter

Best ever envelope filter machine (Sept.) Analog, dual envelope follower utilizing multimode filters and a myriad of state-of-the-art features. There is NOTHING on the market that can match its tone.

The Electro-Harmonix Bi-Filter is an analog, dual envelope follower utilizing multimode filters and myriad of state-of-the-art features. Its tone is virtually unmatched by anything else on the market.

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 circuitry.

The front panel allows direct access to all parameters for realtime tweaking. The envelope of the input signal controls the filters, with an oscillator provided along with controls for the rate and waveform shape. The 2 filters and their controls are identical, with control of the envelope attack/decay characteristics, filter type, frequency, and Q, and envelope and oscillator filter sweep. The output controls each of the filter outputs and the dry input, with inversion controls for each filter input and the ability to arrange the 2 filters in series or parallel. Switches also let you bypass the unit completely, and disengage the effects loop on the fly.

Rear panel connections include input, effects send and return, outputs for the 2 filters and the main output, CV outputs for the 2 envelope detector units, a pair of CV inputs for manipulating the filters from external devices, and a bypass footswitch jack.

Additional View:

Audio Samples:

• Bi-Filter Enveloped Bass semi wah with Dynamic trigger
  789 KB · MP3
  Bass Guitar triggering a tight envelope allowing filter to open and close to display a tight wah tone that is significantly more controlled than any wah pedal.
  
• Bi-Filter fast envelope trigger
  507 KB · MP3
  Drum kit with a fast envelope trigger allowing each drum to be surrounded with a open and closed Bi-Filter filter tone.
  
• Bi-Filter High Pass slow sweeping LFO on drums
  617 KB · MP3
  Drum kit with the Bi-Filter in a high pass filter chain mode with a slow triangle wave LFO setting allowing for slow sweep across the filter setup range.
  

Features:

• Analog, dual envelope follower utilizing multimode filters and a myriad of state-of-the-art features
• The outputs of each filter are available separately as well as mixed with the input signal in the main output
• Front panel allows direct access to all parameters
• The envelope of the input signal controls the filters, with an oscillator provided along with the controls to control the rate and waveform shape
• The 2 filters and their controls are identical, with control of the envelope attack/decay characteristics, filter type, frequency, and Q, and envelope and oscillator filter sweep
• The output controls each of the filter outputs and the dry input, with inversion controls for each filter input and the ability to arrange the two filters in series or parallel
• Switches also let you bypass the unit completely, and disengage the effects loop on the fly
• Rear panel connections include input, effects send and return, outputs for the 2 filters and the main output, CV outputs for the 2 envelope detector units, a pair of CV inputs for manipulating the filters from external devices, and a bypass footswtich jack
• An effects loop allows insertion of the external effects before the filters, after the envelope detection circuitry

Downloads:

Bi-Filter Demo (.ram)

EQ Review (.pdf)

Guitar Buyer Review (.pdf)

Pro Audio Review (.pdf)

Bi Filter Instructions (.pdf)