Thanks for the replies, I spoke with DSI today and there are definitely some issues with multimode which will be addressed in the next OS update.
Here is whats happening if someone would like to test it.
Latest OS 1.0.7.2
In order to play two different sounds/patches at the same time when MultiMode is set to "ON".
The base channel selected in the Global menu is set to 1. Different patches on both layers, or same patches, it doesn't really make any difference.
Scenario 1:
Cubase DAW, two midi tracks, one midi track set to channel 1, the other one set to channel 2.
Split A/B and Stack A+B on Rev 2, both OFF
in order to play two different sounds at the same time ,notes (pitch) on one or the other midi channel needs to be transposed. If both midi channels are playing the same notes (same pitch) Rev 2 is ONLY PLAYING THE SOUND ON MIDI CHANNEL 1.
Scenario 2:
Cubase, two midi tracks, one midi track set to channel 1, the other one set to channel 2.
Stack A+B on Rev 2 is ON
in order to play two different sounds at the same time notes (pitch) on one or the other midi channel needs to be transposed. If both midi channels are playing the same notes (same pitch) Rev 2 is NOT PLAYING ANY SOUNDS.
Scenario 3:
Split A/B on Rev 2 is set to ON
Same as scenario 1