aion HALO Manual - Página 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.

While the overall circuit has barely changed in 50+ years, Electro-Harmonix was legendary for changing

the part values on a whim throughout that time while never advertising the new versions as being

different than previous ones. There are around 20 notable variants and many more minor variations

within those, with nearly every part in the circuit being tweaked at some point or another.

The Big Muff is a pretty easy build and there aren't a lot of things that can be messed up. There's no

biasing or gain sorting for the transistors, and no rare or specialized parts. It's endlessly tweakable,

with dozens of different variants that can be replicated by substituting a few parts. For this reason,

it's become a very popular DIY build-something of a rite of passage for those getting into the hobby.

It's also a great way to experiment and learn how simple audio circuits work, because almost any part

substitution will have some sort of audible effect.

The Halo is a faithful recreation of the Big Muff, allowing any standard variant to be built. A

spreadsheet

compiles all the different variants so you can easily see which parts to substitute if you

want to build a Triangle, Ram's Head, Civil War, or more than a dozen other flavors.

Also included is a midrange switch that allows for the stock mid-scoop tone, a flat midrange response, or

boosted midrange. The presence control mod from the

this version, but the legacy PCB is still available for those who want it.

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

11 Licensing

legacy version of the Halo

versions

has been removed in

TABLE OF CONTENTS