Hey I have a Source, too. I think it sounds great. Er, at least it used to sound great. Mine hasn't been working for some years. I'd like to get it fixed someday, when I can get around to it.
Actually, the Source is totally analog. At least the sound path is analog. But it uses a microprocessor to control the settings. I don't know if I can comment on the sound since I haven't heard it in a while. I also have a Minimoog, which I got after my Source stopped working so I can't compare them. As I remember they were not too different in sound. But I don't think the Source quite has the characteristic Mini sound. Not that that's a bad thing, just a tad different. I seem to remember the Source having a bit smoother sound, a touch less harsh. (Though maybe I'm imagining things.)
Jim