Until PRS Support publishes a HX/DA User Manual that describes exactly what each of the 3 switches functionally do to the signal path on the amp then it's still a mystery/company secret. In spite of all the word of mouth and videos. On the other hand, when I want Allman's clone, I put them all in DA mode, or the Hendrix/Johnson clone, I switch them all to HX. No problem, just dial in a familiar tone and crank it up. Simple and with awesome results every time. That said, it's just that, and my opinion, that as a professional courtesy to the owners of these very expensive top of the PRS product line amps they publish one on the Support Site.