Hrmm... I can describe the UI of the HDD100.
All the buttons are digital. There are 5 buttons on the front. The power button to the right side just below the LCD, and 4 buttons in a diamond-shaped manner.
The top and bottom buttons are used for previous song and next song respectively. They are also touch sensitive. This works very well when you are scrolling through your library, and when you're scrolling through the menu, you can master a light then heavy tap without taking your finger off that allows you to scroll two at a time. It doesn't take much of a learning curve and is very useful
I can't imaging using anything else.
When scrolling through artists, albums, playlists, etc, using the lighter pressing of the top or bottom buttons scrolls through like you'd expect (pretty fast). There is 0 acceleration, though. I actually like it this way. When you hold the button down all the way, it goes faster, and the letter that you are scrolling through pops up. Very helpful indeed.
The left and right buttons are not touch sensitive. They are from switching through menus, going into submenu's, and changing modes. It's a simple forward, backward button. When you are playing a song, you can change from the default Song Title+Time Elapsed Screen to the Song Title+Spectrum Analyzer Screen. VERY fun to look at, though it moves slow enough to not be entirely useful -_-
Hope this helps you all some
