The only way I know is using a tool like Melodyne or even the pitch shift in Peak (which isn't being made) I just tried to make an apple loop out of a 4 bar part, then use the transpose function in the sample edit and got 4 bars of static (YEA!).
I may have forgotten exactly what I used to do, BUT I could make an apple loop, then assign a ket to it (all in the apple loop editor) and then change the key in the track inspector. BUT it doesn't seem to want to do this now... Love when they change something and make Logic work a little LESS better than it was.