I figured the absence of an analog source would yield some discussion... This is something I am definitely not opposed to adding in the future. In fact, you may see it implemented in this system in years to come. However, having my entire music collection available at the disposal of my fingertips, combined with suprisingly good quality sound, has made me put the project on hold for the time being.
I am glad to hear that you are enjoying your vintage Altec speakers as well as I am! Combining Altec's vintage driver technology with Shindo's obsession for reproduced musical integrity has been like finding the Holy Grail after a life-long search through the hi-fi jungle.