I started doing this a few years back. I use modelers not amps. So it works with better modelers and some amp models better than others. One of the things to be aware of is that bass signals eat up more energy than treble. So cutting the bass can help to clear up your signal. In practice, things that help you clean up with your volume knob are treble bleed circuits (on humbuckers especially) and "bright" amp channels (similar concept, a capacitor to filter lows). Beyond that, using a decent amount of gain helps but not having an overly gainy and fuzzy tone. You should be able to go from a little hotter than AC/DC to a nice clear clean tone with the volume this way.