It occurs to me that there is an easily accessible NAS storage volume available for the BT Home Hub: the USB socket in the back (some other routers have them, too).  I use it for software and drivers I need to install in the family computers around the house.  It's always available and doesn't depend on a machine being turned on.

Question is: can it be used for central music storage and playback from Volumio?  I'll give it a try tonight, as it would be more convenient for putting music on to try out than plugging a USB stick into the Pi that generally needs a restart.

Note: I am not a file-based collector, this is just for ease of use.