Squbemic chords

Squbemic chords are essentially tempered chord tempered by the squbema, 729/728.

13-odd-limit squebmic chords belong to a tempering of the 2.9.7.13 subgroup, including two triads and three tetrads.

The two squbemic triads are in inverse relationship:

• 1-9/8-13/9 chord with steps of 9/8-9/7-18/13;
• 1-9/7-13/9 chord with steps of 9/7-9/8-18/13.

They can be extended to palindromic tetrads:

• 1-9/8-14/9-7/4 with steps of 9/8-18/13-9/8-8/7;
• 1-9/8-13/9-13/8 with steps of 9/8-9/7-9/8-16/13;
• 1-9/7-13/9-13/7 with steps of 9/7-9/8-9/7-14/13.

Equal temperaments with squbemic chords include 24, 36, 41, 53, 58, 72, 111, 130, 183, 190, 224, 354, 373, 525, 597, 845, 1028, 1069 and 1724, with 1724edo giving the optimal patent val.