General theory

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Here are some links to some of the key ideas underlying tuning:

Basics

Ratios

Cents

Chords

Scales

Notation

Core Concepts

JI

Regular Temperaments

Equal Temperaments

Periods and Generators

EDO

EDT

MOS Scales

Periodic scale

EDL (Equal divisions of length)

Arithmetic irrational divisions

ADO (Arithmetic rational divisions)

Comma pump

How it Works

Monzos

Vals

Mappings

Patent val

Tempering Out

Rank and codimension

Personal Explanations

Mike's Lectures On Regular Temperament Theory

Keenan's explanation of vals

Javascript tools

Interval calculator--a nice online interval calculator tool, shows linear fraction and EDO fraction expansions, too

An animated Javascript Moment of Symmetry (MOS) ring demo, another untwelve.org creation

An excellent Firefox browser tuning demo synthesizer, 'Wicksynth'

Additional Stuff

Benedetti height

Kees height

Tenney Height

ABC, High Quality Commas, and Epimericity

Graham complexity

Generator complexity

Lumma stability

chord of nature

Modal UDP Notation

Cluster temperament

Consonant Class Scale

Maximum variety

Distributional Evenness

Essential tempering commas

Advanced Theory

Mathematical Theory