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• 07:14, 26 August 2026 BudjarnLambeth talk contribs created page 18ifdo (Created page with "{{Infobox IFDO|steps=18}} '''18ifdo''' (inverse-arithmetic frequency division of the octave), or '''18udo''' (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 17ifdo and a subset of 19ifdo, its inverse is 18afdo. As a scale it may also be known as mode 18 of the subharmonic series or the Under-18 sca...")