couple of questions

[TT Gasman]

First, it was fairly cold in Houston this morning,( about 40deg LOL I know we're wimps) , and the car started right up where lately it has to crank for a while on the first cold start. I suppose because the air is more dense. Should I lean out the mixture a touch so it starts easy all the time?
Second, what is this little adjustment wheel/dial for in the center of the console? Seems like it should control the lights somehow...

[turbo owner]

Looks like speakers to me, for adjusting balance front to rear.