This question is very specific. Is there any daw software with loops with the functionality of changing the tracks notes accordingly to a chosen chord? For example, I add a loop and then change the chord of a part of the song, and then all the notes of that part are changed accordingly. Not just transposing, so for example I can change from a major chord to a minor. I tested garage band and I've had never played with loops before. But it seems to me it's missing a functionality like that.
The piano roll in Fruit Loops Studio has the option to change your left click action from adding a single note to adding a chord. As well as all kind of variations of major, minor, diminished etc. it gives you 9th/11th chords to keep adding notes up and up the scale for a big sound.
It won't change any notes automatically as you change your song, but it does allow you to quickly flesh out a complex sound and accommodate alterations without much effort.
Are you talking about MIDI loops or loops of audio?
For MIDI loops in any DAW, you could select all of the relevant notes and shift them to their correct positions, which takes relatively little time (for example, to change from major to minor chords, select all of the thirds and move them a half-step in the correct direction).
But for audio, there is no "perfect" way to use this, as pitch information isn't explicitly stored in a waveform. There's a program that claims to do this kind of isolation called Melodyne DNA, if I remember correctly, but like timestretching and transposition algorithms, it isn't perfect and will leave behind some artifacts. I don't know of any DAW software that offers this kind of functionality.