Digression exemplified digitally

I'm trying to find the adverb form of the word 'analog' in the "opposite of digital" sense. The dictionary isn't immediately clear, so I'm Googling for the answer. I came across this message board, where one Nate Branscom asks the same question. He receives a multiplicity of uncited and unsupported answers before the conversation digresses into a conversation about audio formats in the 1970s or something like that. Go ahead: take a look and see if you have the patience to follow the winding thread.