No. The dimmer only works in DMX mode.
Sound active is pre-programmed with different chases, which work well.
I use a Chauvet Model 50 A Controller for the Mega Pixel. A few chase programs using all the channels, including the dimmer, and you are all set.
The Chauvet Controller also has a Sound Active mode within it.
The big thing with the American DJ fixture is that because it has so many channels, you can really set up an elaborate chase sequence should you happen to get 4 or more of these fixtures.
The availability of the extra DMX channels opens a wide variety of possibilities with the American DJ fixture that simply doesn't exist with the Chauvet fixture.
As for the fixture remembering a setting...NO...the controller remembers the settings you program into it.