I want to delete some music titles or albums from my iphone but it doesn´t work as described in the manual. There I read:"Connect your iphone to the pc, click the triangle left of the symbol to show the iphone´s contents. Then choose i.g. music and mark the titles you want to delete. So far so good! Now the manual says press the "stepback-key" (I am German and the German name is "Rückschritttaste")but on my windows PC this doesn´t work. So what can I do? Thanks for your help!