We in the Bachelor are looking at the next step in terms of a device in the Third Pillar: Music/Audio.  We presently use an off-the-shelf solution which was good to have years ago when we got it.  But here are some its limitations.  It doesn't allow you to switch between playlists with next or previous buttons like you would with the tracks.  It would be useful on the road when you want to switch "stations," sort to speak, and not have to pull over to do it.  Also we'd want a wireless ability to manage tracks, though we're not sure whether Bluetooth would help here or not.  We don't always want to have to sync every time we make changes using a central controller like a laptop or a desktop.  And of course it's got to have an elegance to it, but we're hard pressed to see anything out there that comes close.  And no, we're not going the smartphone/touchscreen/tabletized route.  A serious audiophile demands a more dignified approach.  That's why we're looking at a DIY solution, to make use of the Heir's geeky skills in electronic assembly to boot.  If we're ever successful, the device itself will be known as Music The Third Pillar, rather it being a filename type label for an OTS that's actually called something else.