User Guide

INTRODUCTION

In the complex world of modulation instruments, Electro-Harmonix introduces the Bi-Filter. It’s a totally analog

instrument, drawing upon the filter designs of the past while utilizing a front panel that brings EVERY relevant control,

for every parameter, to the surface. You are given complete interactive access. Exquisite tone was the bottom line in this

design and the “hands-on control” aspect presents the musician or engineer with the ability to make global, real-time

tone changes that can make the difference between a hit and a miss.

The uniqueness of dual filters working with or against each other presents possibilities only limited by the user's

creativity. The sameness of digital filters, by their very “perfect nature” pale in comparison to the “random” fluidness

that analog filters present. Their uniqueness and full-bodied tone are possibly the most emulated aspects of today’s

modern instruments. Emulations are fine, but the real deal is special.

The Electro-Harmonix Bi-Filter combines two versatile “all analog” envelope and LFO controlled filters in a

configuration that enables the most complex and interesting filter sounds ever possible.

The Bi-Filter continues the tradition of the original Mu-Tron, Beigel Sound Lab and Electro-Harmonix Q-tron products

by using opto-electronic “photo-mod” control. The “state-variable filter” architectures produce the clean and unique

sound, with selectable filter curves preferred by top professionals.

The Bi-Filter uses all analog circuitry, for the best dynamic range and signal-to-noise characteristics of any available

filter product. The effect circuit also uses “true bypass” switching to allow pure unmodified instrument throughput

when the effect is switched off.

The Bi-filter is a single-channel processor, though the filter outputs are individually available. The main effect output is

a single channel MIX of Filter 1, Filter 2 and the input signal. An external FX loop between the input and the filter

allows the use of audio processes without distorting the signal input’s envelope waveform, providing simple access to a

new range of sounds that are reactive to the dynamic of the user—whether engineer, musician or DJ. The Bi-Filter has

all of the best aspects of the past with a sound that makes digital instruments and recordings come alive.

Front Panel

Back Panel