Okay, thanks, but I do not exactly follow...My expertise in audio lingo is not among the sharpest I know, so could you kindly elaborate a little more? Are you saying the "relay with remote control" allows a more refined control of the volume?
My experience might not be representative as there may have been something wrong with my unit but I hated the relay. I settled on the middle option with remote control, it's totally smooth. With the relay you're going to hear some audible clicks and noise as it moves (audible in the sense that you can hear it mechanically moving, not inline in the audio stream). On mine there were also excessive clicks and pops in the audio stream which people assured me was not normal. In theory you're supposed to get fine grained control and it's supposed to have better audio quality. I couldn't tell a difference in sound quality when I got my unit back with the mid-level volume knob. IMO if you like throwing away your money get the relay option.