#1
ok, so i understand that the inversion of an A4 is a d5. So say you start off on D# on the staff and want an A4 going down. That would actually be an A flat right? Because if it was going up it would be a d5, A flat. Am i correct or no?
#3
what? im doin it like this- say you have a C major scale- CDEFGABC- on a staff. If you want a d5 going up then it's G#. The inversion would be an A4 going down/backwards. So it would be a G#. I got it, i just got confused
#4
Major(x) <--invert--> Minor(9-x)
Minor(x) <--invert--> Major(9-x)
Perfect(x) <--invert--> Perfect(9-x)
Augmented(x) <--invert--> Diminished(9-x)


Is this clear enough, or do you want some examples?
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#6
It's wrong.

The augmented fourth below D# is A. The fourth below D# is an A#, and if you go downwards with an augmented step, you either substract a sharp or add a flat.

Other way around. Inversion of A4=D5. P5 above D#=A#. Since D5 is one semitone beneath P5, D5 of D#=A

Or, following the formula:

x = the interval, in this case a fourth.
Augmented(x) <--invert--> Diminished(9-x)
Augmented(4) <--invert--> Diminished(9-4) = Diminished fifth

Done
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