Aion Electronics HALO Посібник - Сторінка 2

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1 Project Overview

2 Introduction & Usage

INTRODUCTION

The Halo Distortion/Sustainer is a recreation of the Electro-Harmonix Big Muff Pi, first released in

1969. Originally marketed as a "harmonic distortion sustain", it has been lumped together with fuzz

effects, although it's a very different animal than classic fuzz effects like a Fuzz Face or a Tone Bender.

The Big Muff is something of a "rite of passage" for pedalbuilders. It's a pretty easy build and there

aren't a lot of things that can be messed up. There's no biasing or gain sorting, and no rare or specialized

parts are needed. It's endlessly tweakable, with dozens of different variants (some of which sound very

different) that are just a matter of substituting a few parts.

The Big Muff circuit was adapted by a number of other pedal manufacturers in the 1970s. Notably, the

4th version of the Colorsound Tone Bender, called the Supa Tone Bender and released in 1973, was

based on the Big Muff circuit. The next version of the Tone Bender, called the Jumbo Tone Bender and

released in 1976, changed the standard Big Muff circuit by removing the 4th transistor, a make-up gain

stage after the tone control. This 3-transistor variant was copied by other manufacturers as well.

The Halo PCB allows you to easily build either the 4-transistor or the 3-transistor variant.

USAGE

The Halo has the following controls:

• Sustain controls the amount of drive or distortion, which also affects the amount of sustain.

• Tone is a control that pans between a low-pass filter (high cut) and a high-pass filter (low cut). At the

12:00 position, the bass and treble are flat, and the midrange tone response is based on the setting

of the Mids switch.

• Volume is the overall output.

• Mids allows you to switch between Mid Scoop (the stock setting), Mid Hump, or Flat Mids.

HALO DISTORTION/SUSTAINER

10 Licensing

TABLE OF CONTENTS