Subharmonics 11–22: Difference between revisions

{{Infobox IFDO|steps=11}}

'''11ifdo''' ([[IFDO|inverse-arithmetic frequency division of the octave]]), or '''11udo''' ([[utonal division]] of the octave), would divide the [[octave]] into eleven inverse-arithmetically equal parts. It is a superset of [[10ifdo]] and a subset of [[12ifdo]], its inverse is [[11afdo]]. As a [[scale]] it may also be known as mode 11 of the subharmonic series or the Under-11 scale.

It does not contain a perfect fourth or perfect fifth directly above its root, giving it an ungrounded 'floating' feeling similar to the 12edo whole tone scale ([[6edo]]), but with a similar step size to the chromatic scale of 12edo, and with very [[xenharmonic]] new harmonies available. Composers who find [[11edo]] and [[13edo]] appealing are likely to enjoy 11ifdo for similar reasons.