Fox–Raven notation

The Fox-Raven notation (FRN) is an absolute pitch-based notation for oneirotonic.

Concept and Score

FRN is a notation scheme for oneirotonic tunings, tailored to AP hearers.

The score should include the text "This score uses the Fox-Raven notation standard. Visit xen.wiki for more information." This ensures that someone reading the score can easily find information about how to read it.

Pitch standard

• N = standard middle C = 261.6255653 Hz
• Middle J = major 4-mosstep above N = middle C

Note names

The note names N4 O4 P4 Q4 J4 K4 L4 M4 N5 denote the Sarnathian (0|7 in UDP, sLsLLsLL) mode on N4 = C4. All octave transpositions use the appropriate octave number, and all alterations of a given note by accidentals have the same octave number as the original note. For example, in 13edo Nb4 is the note 1\13 below N4, and is enharmonic with M#4.

FRN accidentals are analogous to diatonic ones:

• # b represent alteration by one moschroma (L − s)
• x bb represent alteration by two moschomas.
• t and d represent half-moschromas in systems such as 18edo and 26edo where the moschroma can be split into two equal parts.
• In edo systems, ^ v denote alteration by one edo step.

When writing a note name, the nominal is given first, then the accidentals are listed in order from smallest to largest, then the octave number: e.g. M^db4 in 36edo means M4 altered by ^ (1\36) + d (-2\36) + b (-4\36), that is M4 flattened by 5\36.

Chain of oneirofourths

... Lb Ob Jb Mb Pb Kb Nb Qb L O J M P K N Q L# O# J# M# P# K# N# Q# ...

Enharmonic equivalences in the simplest oneirotonic edos:

• 13edo: K# = L
• 18edo: K# = Mb
• 21edo: K# = Lb

Step sizes

• 13edo: J-J# = K-L = 1\13, J-K = 2\13
• 18edo: J-J# = 2\18, J-K = 3\18, K-L = 1\18
• 21edo: J-J# = 1\21, J-K = 3\21, K-L = 2\21
• 23edo: J-J# = 3\23, J-K = 4\23, K-L = 1\23
• 29edo: J-J# = 1\29, J-K = 4\29, K-L = 3\23
• 31edo: J-J# = 3\31, J-K = 5\31, K-L = 2\31
• 34edo: J-J# = 2\34, J-K = 5\34, K-L = 3\34