There is, of course, Robert Moog saying in an interview that due to sampling rates you get digital aliasing, which you can hear. The thought goes like this: sound is a gradual change of an amplitude over time. In analog circuits this continuous change is preserved and this retains the natural sound, as opposed to a stepped digital curve. However, here is some useful perspective:
What you see in the digital domain as a stepped curve is not what you actually hear.
If you're curious how a DAC works, this is helpful:
Just like your instrument for how it sounds, not how it generates it (GUI/knobs aside).