Usability is a serious concern, because most navigation is done with one button, Click, Double-click, Triple-click. Click-and-hold. http://support.apple.com/kb/

Usability is a serious concern, because most navigation is done with one button, Click, Double-click, Triple-click. Click-and-hold. http://support.apple.com/kb/HT3458 http://support.apple.com/kb/HT3458 The one exception is stepping through playlists - with the volume controls. It's modal (modeful?), so you have to track of the state of the device to know the meaning of the controls. This is terrible UI design, and very unlike Apple. A symptom of Steve's absence?