I think the idea of the JMD is the "D" is digital = modeller...
If you've tried the JMD-1, you'll note what a good job they did capturing the Marshall tones/sounds & in an authentic way.
I haven't really tapped into mine yet. I just dialed in the JVM tone & it rocks. Kinda went through all the topology settings, but didn't really explore them. There's just so much to explore. I'd like them to do a full on rack system, w/ integrated DSP & stereo outs...