For acoustic sounds using JTV and Pod HD, I found elsewhere in the forums the trick to use the effect loop "send" of the HD to route the signal to a dedicated acoustic amp, with no "return" cable. Strangely enough, using "no amp" on the HD and routing the final HD signal to the acoustic amp produces quite a different (and bad) sound, which can be considered a bug.
Although this trick works fine, it actually prevents you from using you HD effect loop for something else, e.g. when using it withe JTV electric models routed to a DT amp.
For those of you using JTV, POD HD and StageSource, could you confirm that you can can decent electric AND acoustic sound on the StageSource, and conveniently switch between them without having to fiddle with the HD effects loop ?