Key Signatures

Key Signatures in Ooloi have been specified and implemented, and as a result we have a new Architectural Design Record, ADR-0034, on the Key Signature Architecture.

Standard Key Signatures

​​It covers standard key signatures – the usual and expected: major, minor and modal in all keys:

Key signatures with double flats or sharps are also supported:

Ich fühle Luft von anderem Planeten

​Ooloi also supports keyless signatures, custom key signatures mixing flats and sharps, as well as microtonal key signatures.

Ooloi also handles key signatures where accidentals differ between octaves (for those moments when you feel your beard turning blue).

Playback

All this works with playback, of course, and even the microtonal key signatures handle cautionary accidentals between voices and measures as expected, according to the engraving principle of 'remembered alterations'.

A note on the ADR: It's not the UI

The ADR shows the internal architecture - what the software does behind the scenes. Users enter key signatures through standard dialogs: 'Eb major', 'D Dorian', etc. The technical infrastructure matters because it's what enables all those custom and microtonal features to work seamlessly alongside standard notation.