ch9_5

Four tetrads five

Open in Scale Workshop Scala analysis Download scl

Properties

Notes	9
Period	1200.0 ¢
Just	7-limit
Source	Mailing lists
Reference	https://yahootuninggroupsultimatebackup.github.io/tuning-math/topicId_11446.html#11446
Thread	6 scales

Tone	Tone (¢)	Step	Step (¢)
21/20	84	21/20	84
7/6	267	10/9	182
49/40	351	21/20	84
5/4	386	50/49	35
21/16	471	21/20	84
7/5	583	16/15	112
3/2	702	15/14	119
7/4	969	7/6	267
2	1200	8/7	231

Parent scales

File	Notes	Max diff (¢)
cpak19	19	0.0
euler20	20	3.0
notchedcube	28	0.0
euler24	24	3.0
miracle24_tuning_66493_66493	24	4.1
miracle24	24	4.1
xen13-grady-19-1	19	7.7
qx1	31	0.4
cpak31	31	0.7
xen12-wilson-23-repeated-2	20	7.7

Child scales

File	Notes	Max diff (¢)
parizekmic5	5	18.0
slendro10	5	22.9
met24-slendro10-var_C	5	23.8
met24-quasi_5-EDO_F	5	24.9

Mailing list post

From: Gene Ward Smith (2004-08-30)
Subject: Four tetrads, nine notes

I went looking for scales containing four tetrads in the -1 to 1 chord
cube, one of which was [0,0,0]. I found six such scales, the first two
of which are permuation epimorphic, which I give below. I also found
six ten-note, four tetrad scales which are strictly epimorphic.

! ch9_1.scl
Four tetrads one <9 14 21 26| permutation epimorphic
9
!
21/20
6/5
5/4
21/16
3/2
12/7
7/4
9/5
2

! ch9_2.scl
Four tetrads two <9 14 21 26| permutation epimorphic
9
!
21/20
35/32
5/4
21/16
35/24
3/2
49/32
7/4
2

! ch9_3.scl
Four tetrads three
9
!
15/14
35/32
5/4
35/24
3/2
25/16
7/4
15/8
2

! ch9_4.scl
Four tetrads four
9
!
49/48
35/32
7/6
5/4
7/5
35/24
3/2
7/4
2

! ch9_5.scl
Four tetrads five
9
!
21/20
7/6
49/40
5/4
21/16
7/5
3/2
7/4
2

! ch9_6.scl
Four tetrads six
9
!
7/6
5/4
4/3
7/5
10/7
3/2
5/3
7/4
2

Full thread (1 messages)

From: Gene Ward Smith (2004-08-30)
Subject: Four tetrads, nine notes

I went looking for scales containing four tetrads in the -1 to 1 chord
cube, one of which was [0,0,0]. I found six such scales, the first two
of which are permuation epimorphic, which I give below. I also found
six ten-note, four tetrad scales which are strictly epimorphic.

! ch9_1.scl
Four tetrads one <9 14 21 26| permutation epimorphic
9
!
21/20
6/5
5/4
21/16
3/2
12/7
7/4
9/5
2

! ch9_2.scl
Four tetrads two <9 14 21 26| permutation epimorphic
9
!
21/20
35/32
5/4
21/16
35/24
3/2
49/32
7/4
2

! ch9_3.scl
Four tetrads three
9
!
15/14
35/32
5/4
35/24
3/2
25/16
7/4
15/8
2

! ch9_4.scl
Four tetrads four
9
!
49/48
35/32
7/6
5/4
7/5
35/24
3/2
7/4
2

! ch9_5.scl
Four tetrads five
9
!
21/20
7/6
49/40
5/4
21/16
7/5
3/2
7/4
2

! ch9_6.scl
Four tetrads six
9
!
7/6
5/4
4/3
7/5
10/7
3/2
5/3
7/4
2

Raw file

! ch9_5.scl
Four tetrads five
9
!
21/20
7/6
49/40
5/4
21/16
7/5
3/2
7/4
2
!
! https://yahootuninggroupsultimatebackup.github.io/tuning-math/topicId_11446.html#11446
!
! [info]
! source = Mailing lists
! file = tuning-math/messages/yahoo_tuning-math_messages_api_raw_9945-12429.json
! topic_id = 11446
! msg_id = 11446