I have two mp3 tracks.
Track1 has a key of A flat major. Track2 has a key of D minor.
I would like to increase the key of track1 to match the key of track2 without changing the speed of track1 so it won't sound like the vocalist is singing after inhaling helium. If I can get both tracks on the same key, I plan to do a mashup with them with the Mashup2 software.
I also have a Mac with Garage Band in case that software can be used to do the key change.
I tried several online tools but they all left track1 sounding like the vocalist inhaled helium. :-)