CVs change to control soundtraxx  to control horns etc they the led unit when the sound is in another unit

So, I have an Atlas U23b with an unknown decoder in it.
I tried to set CV 8 to 8, had no effect, except when I read CV 8 it is now 8, or whatever value I last entered, Also tried all the other reset procedures could find, none worked.
Other funny things:
The headlight and mute are mapped together, so turning on the headlight also mutes or unmutes the sound.
When setting the speed to 0 from a slow speed, the locomotive continues to move, independently of the momentum setting, as if it is on speed step 1.

Once again, I do not have any "electric mojo" to do this without your help. The advice for the Shinnohara switches worked out great. Now, I'm on the last leg of wiring my railroad.

Here is the basic info: I have one lead track coming to the turntable. The turntable is a manual one with two wipers underneath (one wire from each soldered to the rails on the bridge) and there are three enginehouse tracks. None of this is wired at present.