This is part 2 of the ISO EC Project.

The ISO EC Project was initially introduced on our previous article

The updated ISO EC layouts can be found below.

ISO EC layout intervals

The full (56 button) ISO EC layout is shown below with all semitone intervals annotated and color coded.

Keyboard Layout Intervals

ISO EC keyboard layout dimensions

The keyboard layout with annotated dimensions and intervals is shown below.

Keyboard Layout

Also you can download a true-to-scale Keyboard layout PDF for print and experimentation.

ISO EC Scales Fingering Patterns

The fingering patterns for all major and minor scales are shown below.

Major and Minor Scales

Also you can download a true-to-scale Major and Minor scales PDF for print and experimentation.

The fingering patterns for all blues and pentatonic scales are shown below.

Blues and Pentatonic Scales

Also you can download a true-to-scale Blues and Pentatonic scales PDF for print and experimentation.

ISO EC Chords Fingering Patterns

The fingering patterns for all major & minor chords are shown below.

Major and Minor Chords

Also you can download a true-to-scale Major and Minor chords PDF for print and experimentation.

The fingering patterns for all augmented & diminished chords are shown below.

Augmented and Diminished Chords

Also you can download a true-to-scale Augmented and Diminished chords PDF for print and experimentation.

The fingering patterns for all flat5 & sus4 chords are shown below.

Flat5 and Sus4 Chords

Also you can download a true-to-scale Flat5 and Sus4 chords PDF for print and experimentation.

Lastly but probably most practical, you can download a complete PDF with all the resources here: ISO EC System

Next Steps

This is a very long time-frame project (I don’t have much time, only a bit after-work sometimes), but my thoughts on next steps are along the lines of:

  • Community feedback / interest (is the idea any good? is it worth spending nights on? :))

Then, based on above merit, baby-steps iterations towards:

  • Getting some sort of non-functional to-scale proof of concept

Then if the idea still holds value, using an old concertina to try to repair/devise:

  • A functional prototype.

Although I am an engineer and have been working on this idea for some time – as I am really interested in squeezeboxes (accordions and concertinas) – my experience in this area is very limited. Nevertheless, I hope you found some of these thoughts interesting ;).



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