2ifdo
Template:Infobox IDO 2ido, if the attempt is made to use it as an actual scale, would divide the octave into two inverse-arithmetically equal parts. The only non-trivial interval is the just perfect fourth 4/3, since 4/3 is inverse-arithmetically halfway between 1/1 and 2/1.
Intervals
| # | Cents | Ratio | Decimal | Interval name | Audio |
|---|---|---|---|---|---|
| 0 | 0.0 | 1/1 | 1.0000 | perfect unison | |
| 1 | 498.0 | 4/3 | 1.3333 | just perfect fourth | |
| 2 | 1200.0 | 2/1 | 2.0000 | perfect octave |