Good question. The tone knob goes from warm and wooly to bright very quickly, so it makes sense to ride the tone knob at 3 or below. The coil-tap is useful in that you can go from a gainy feel to a cleaner feel with the tone knob push-pull solely. Of course, Dave rides his guitar volume at 7 or above, typically full up for leads, and 7 or 6 for cleans.
Based on what I've viewed from several YT videos, the DGT SE can imitate the Allman Bros, ZZ Top, as well as create soulful coil-tapped licks that cleans up well .
A fan of both the Fillmore East and early ZZ Top releases, the DGT SE will help you towards finding your signature sound, though in my instance, my belief is that the DGT SE targets a narrower range of tones without sacrificing quality at the lower price point. If perhaps you dig Dave's sound, research some of his YT interviews (posted earlier) and find out how he dials in his sound. Dave doesn't namedrop that much, but does mention some band names as influences.