I remember the Rockbox firmware for MP3 players having something similar. I was (and am still) amazed how efficient the UI/navigation was in relation to how lim

I remember the Rockbox firmware for MP3 players having something similar. I was (and am still) amazed how efficient the UI/navigation was in relation to how limiting the (hardward) controls were on some of those players. It took a little while to understand how it works, but that tiny bit of learning curve was well worth it.