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• 07:13, 26 August 2026 BudjarnLambeth talk contribs created page 11ifdo (Created page with "{{Infobox IFDO|steps=11}} '''11ifdo''' (inverse-arithmetic frequency division of the octave), or '''11udo''' (utonal division of the octave), if the attempt is made to use it as an actual tuning system, would divide the octave into sixteen 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 sca...")