4afdo
Jump to navigation
Jump to search
4afdo (arithmetic division of the octave), or 4odo (otonal division of the octave), divides the octave into four parts of 1/4 each. As a scale it may be known as mode 4 of the harmonic series or the Over-4 scale. Because 4 is a power of 2, 4afdo corresponds to the 4th to 8th harmonics octave-reduced. The notes of 4afdo create a harmonic seventh chord.
Intervals
| # | Cents | Ratio | Decimal | Interval name | Audio |
|---|---|---|---|---|---|
| 0 | 0 | 1/1 | 1.0000 | perfect unison | |
| 1 | 386.3 | 5/4 | 1.2500 | just major third | |
| 2 | 702.0 | 3/2 | 1.5000 | just perfect fifth | |
| 3 | 968.8 | 7/4 | 1.7050 | harmonic seventh | |
| 4 | 1200.0 | 2/1 | 2.0000 | perfect octave |