原帖由： oldturkey03 ,
Apparently there is a bug in the first generation iPod Touch (1G) with Apple’s OS 3.0 installed. Users are unable to change the volume using the usual double-tap of the home key.I guess what happened is that the assumption is made that the iPod has a volume switch and since the headphones are not plugged in , it must be connected to a dock. So make sure that you have proper headphones, since some of them can cause your volume bar to not reappear. So you could try to reconnect with new/different headphones or speakers, and see if the controls will show up. You could also try to restore your iPod with a different firmware, however, that '''will erase your data'''.There could also be issues with the audio jack. Let us know how it is going. Good Luck.