App to live transpose midi loops based on chords played?

espiegel123

@wim said:

…A C major chord and an A minor chord do have the same notes. However, it's the intervals that make a minor vs major cord.

Maybe you mean scale not chord? The c major and a natural minor SCALES have the same notes. But a c major chord and a minor chord do not have the same notes.

C major chord: C E G

A minor chord: A C E

seonnthaproducer

@wim said:

@seonnthaproducer said:
A song written in A Minor is the same as a song written in C major because Aminor is the relative minor of CMajor.

So, transposition will be the same thing as if you transposed in Cmajor.

You haven't said anything incorrect there, but you've misunderstood the context. With pitch shifting you're not transposing in scale. A C major chord and an A minor chord do have the same notes. However, it's the intervals that make a minor vs major cord.

A major triad's intervals are 0 +4 +3 semitones between the notes. A minor triad's intervals are 0 +3 +4 semitones between the notes. If you just take a C major chord and pitch shift it down to A, you still have the same major semitones difference between them. You will have an A major chord. You can trust me on that.

I don't have time to explain in further depth right now. If you're interested in not continuing to be wrong on this point, you really should look further into what you're saying.

Learnt something new today. Thanks, @wim

wim

@espiegel123 said:

@wim said:

…A C major chord and an A minor chord do have the same notes. However, it's the intervals that make a minor vs major cord.

Maybe you mean scale not chord? The c major and a natural minor SCALES have the same notes. But a c major chord and a minor chord do not have the same notes.

C major chord: C E G

A minor chord: A C E

Thanks, you're correct. I should have not tried writing that when pressed for time.

tyslothrop1

On desktop, there are pitchshifters that can respect scales. Zplane retune, zynaptic pitchmap and eventide Quadra-/Octavox, off the top of my head.

Not sure, if maybe Eventide qvox (is it the same as quadravox?) is able to do it on iOS, although I think it still wouldn't fit the OP's needs.

Gravitas

To clarify..

Pitchsifters work on audio
Transposition tools work on midi

From the OP's original question it sounds like they need a midi tool.

Errorplane

@tyslothrop1 said:
On desktop, there are pitchshifters that can respect scales.

That blows my mind! As does stem separation - truly magic is at work here.

But I'm really looking for a midi tool as @gravitas says.