D512S - Creating gradient across 29 RGB fictures

[Vis AV]

Hello
I am able to induividually control all 29 fixtures, as well as indivually and group.
However, I purchased this standalone unit as yu could create a gradient across all the fixtures (as with the Entec devices) rather than adjusting them all individually.
Please can you let me know how I can do this in Show express.
In addition please can you let me know where the master fader is in order to adtust the intensity of all the fixtures

Thank you