I started experimenting with GarageBand for the iPad yesterday, and noticed that there was no built in feature for changing the Key (pitch) on a specific loop when creating music. You can only change the Key for the whole song. That's quite bad. You can in GarageBand for Mac though.
After doing some searching on the web I realized that there was more users with the same problem but no one had a solution for it. So I started to try to find a solution myself and after a while I found a way doing it. It only works on Apple loops though and not on audio you record directly in GarageBand.
Watch the video below to see how I do it.