The HX/DA was made to exactly replicate two different amps. Jimi's Super Lead and Duanes Super Bass. Then with the way Paul put the different part values on different switches, it allso allows the flexibility to do some things in between the two.
What I read about the Recording amp was that it was an exact copy of Eric Johnsons Super Lead, so no switching, no Super Bass settings, but HOLY CRAP it should be a great amp and I saw one used at TGP for a STUPID low price.