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→Inversions/Equivalence
R 4 5 R
-P4- -M2- -P4-
If we extend the sus2 for 2 octaves and align the interval pattern with sus4, they match:
Sus2: R 2 5 R 2 5 R
-M2- -P4- -P4- -M2- -P4- -P4-
Sus4: R 4 5 R
-P4- -M2- -P4-
This means the chords are basically equivalent, simply using a different root note. 2nd inversion sus2 is a sus4, while 1st inversion sus4 is a sus2.
Gsus2 Dsus4/A
E--------------------
B--------------------
G--------------------
D--7-(A)------5-(G)--
A--5-(D)------5-(D)--
E--3-(G)------5-(A)--
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