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Felix Roos
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@ -9,7 +9,7 @@ import Box from '@components/Box.astro';
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# Understanding Chords and Voicings
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Let's dig deeper into how chords and voicings work.
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Let's dig deeper into how chords and voicings work in strudel.
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I'll try to keep theory jargon to a minimum, so hopefully this is approachable for anyone interested.
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## What is a chord
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@ -194,3 +194,128 @@ In a `voicing dictionary`, each chord symbol is assigned one or more voicings.
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The `voicing` function then picks the voicing that is closest to the `anchor` (defaults to `c5`).
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The handy thing about this approach is that a `voicing dictionary` can be used to play any chord progression with automated voice leading!
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## The default dictionary
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When using the default dictionary, you can use these chord symbols:
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```
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2 5 6 7 9 11 13 69 add9
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o h sus ^ - ^7 -7 7sus
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h7 o7 ^9 ^13 ^7#11 ^9#11
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^7#5 -6 -69 -^7 -^9 -9
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-add9 -11 -7b5 h9 -b6 -#5
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7b9 7#9 7#11 7b5 7#5 9#11
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9b5 9#5 7b13 7#9#5 7#9b5
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7#9#11 7b9#11 7b9b5 7b9#5
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7b9#9 7b9b13 7alt 13#11
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13b9 13#9 7b9sus 7susadd3
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9sus 13sus 7b13sus
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aug M m M7 m7 M9 M13
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M7#11 M9#11 M7#5 m6 m69
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m^7 -M7 m^9 -M9 m9 madd9
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m11 m7b5 mb6 m#5 mM7 mM9
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```
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The available chords and the format is very much inspired by [ireal pro chords](https://technimo.helpshift.com/hc/en/3-ireal-pro/faq/88-chord-symbols-used-in-ireal-pro/).
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Some symbols are synonymous:
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- "-" is the same as "m", for example C-7 = Cm7
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- "^" is the same as "M", for example C^7 = CM7
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- "+" is the same as "aug"
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You can decide which one's you prefer. There is no international standard for these symbols.
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To get a full chord, the symbols have to be prefixed with a root pitch, e.g. D7#11 is the 7#11 chord relative to the pitch D.
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Here are all possible chords with root C:
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<MiniRepl
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client:visible
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tune={`chord(\`<
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C2 C5 C6 C7 C9 C11 C13 C69
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Cadd9 Co Ch Csus C^ C- C^7
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C-7 C7sus Ch7 Co7 C^9 C^13
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C^7#11 C^9#11 C^7#5 C-6 C-69
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C-^7 C-^9 C-9 C-add9 C-11
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C-7b5 Ch9 C-b6 C-#5 C7b9
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C7#9 C7#11 C7b5 C7#5 C9#11
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C9b5 C9#5 C7b13 C7#9#5 C7#9b5
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C7#9#11 C7b9#11 C7b9b5 C7b9#5
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C7b9#9 C7b9b13 C7alt C13#11
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C13b9 C13#9 C7b9sus C7susadd3
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C9sus C13sus C7b13sus C Caug
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CM Cm CM7 Cm7 CM9 CM13 CM7#11
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CM9#11 CM7#5 Cm6 Cm69 Cm^7
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C-M7 Cm^9 C-M9 Cm9 Cmadd9
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Cm11 Cm7b5 Cmb6 Cm#5
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>\`).voicing().room(.5)`}
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punchcard
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/>
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Note that the default dictionary contains multiple ways (= `voicings`) to play each chord symbol.
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By default, the `voicing` function tries to minimize jumps.
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You can alter the picked voicings in various ways, which are now explained in further detail:
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## anchor
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The `anchor` is a note that is used to align the voicings to:
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<MiniRepl client:visible tune={`anchor("<c4 g4 c5 g5>").chord("C").voicing().room(.5)`} punchcard />
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By default, the anchor is the highest possible note the voicing can contain.
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When deciding which voicing of the dictionary to pick for a certain chord, the voicing with a top note closest to the anchor wins.
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Note that the anchors in the above example match up with the top notes in the pianoroll.
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Like `note`, anchor accepts either midi numbers or note names.
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## mode
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With `mode`, you can change the way the voicing relates to the `anchor`:
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<MiniRepl
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client:visible
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tune={`mode("<below above duck root>").chord("C").anchor("c5").voicing().room(.5)`}
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punchcard
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/>
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The modes are:
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- `below`: the top note of the voicing is lower than or equal to the anchor (default)
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- `above`: the bottom note of the voicing is higher than or equal to the anchor
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- `duck`: the top note of the voicing is lower than the anchor
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- `root`: the bottom note of the voicing is always the root note closest to the anchor
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The `anchor` can also be set from within the `mode` function:
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<MiniRepl client:visible tune={`mode("<below above duck root>:c5").chord("C").voicing().room(.5)`} punchcard />
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## n
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The `n` control can be used with `voicing` to select individual notes:
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<MiniRepl
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client:visible
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tune={`n("0 3 1 2").chord("<C <Fm Db>>").voicing()
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.clip("4 3 2 1").room(.5)`}
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punchcard
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/>
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## Example
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Here's an example of a Jazz Blues in F:
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<MiniRepl
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client:visible
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tune={`let chords = chord(\`<
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F7 Bb7 F7 [Cm7 F7]
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Bb7 Bo F7 [Am7 D7]
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Gm7 C7 [F7 D7] [Gm7 C7]
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>\`)
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$: n("7 8 [10 9] 8").set(chords).voicing().dec(.2)
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$: chords.struct("- x - x").voicing().room(.5)
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$: n("0 - 1 -").set(chords).mode("root:g2").voicing()
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`}
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punchcard
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/>
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The chords are reused for melody, chords and bassline of the tune.
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