In CAB1 mode, exactly the same way as you did with the CAB1.
If this is a model with the smoke regulator, it's a tad harder to control the smoke volume than it is with Legacy.
For models with a smoke regulator, here's some additional keys.
AUX1, AUX2, 9, <L,M,H>, then AUX2 again to save the setting. This sets the smoke volume to the selected level. Obviously, you only use one of the <L,M,H> keys at a time.
The L,M,H, buttons are the momentum buttons, they also double in function to select smoke volume.