The Register Hardware have published a review of the Creative Zen X-Fi 16GB digital player. 'The exterior controls of the X-Fi are a little unusual with no less than 13 buttons on the front. The cardinal buttons of that 3 x 3 grid perform the same functions as the navpad on the Zen - previous/next track, volume up/down, skip forward/back etc - while the central button acts as an action key. That doesn't tell you what the buttons at the four corners are for - they come into play when you fire up the IM application, but more on that below.
Above and below the 3 x 3 grid are four more buttons - again largely as per the Zen – for play/pause/record, a user-defined shortcut key, options and menu/back. Tucked away around the back of the player is the on/off/lock switch. It took us a while to work out this was actually the power switch as well as the lock switch – the coin dropped only after an fruitless five minutes trying to get the thing to spring into life. Guess we should have read the instructions.'
Read: Creative Zen X-Fi 16GB media player - Register Hardware