Synthmaster 2 Duo mode?

[El Bura]

Is there a way to put Synthmaster2 into a "Duo" mode (like the duo mode on U-he's Diva) where oscillator 1 is is being directed to the lower key and oscillator 2 is being directed to the upper key in parallel? I've checked through he manual but there's no detail about it and I've tried playing about with mono and legato but with no joy. Any guidance is appreciated.

Cheers