A few question

[enyaw]

Hi, I am the new guy with NC. I am still learning a few things about the the car. Went for a drive on Wednesday (250 kms). Do these NC's bounce a bit on uneven bitumen? At 110kms on rough road it didn't want to hold a consistent line. I have had the shocks and suspension checked out and all is OK. It has new boots (Sailun Atrezzo ZSR) asymmetrical tyres at 30 Psi.
The DSC switch? The manual doesn't mention anything about it. When the ignition is first turned on a DSC light illuminates OFF with a picture of a car with skid lines. Does this mean that the DSC is disengaged or engaged?
As this is my first convertible can one expect to hear the radio or a CD at 110 kph? (Hood down)
The Hard top when up, creaks more so at 40 kph. Any solutions, I have sprayed silicone on all the rubbers, hasn't helped much.
Any comments would be appreciated.
Responding to some comments from my first post, I will join the Mazda Club here in Perth.

Thanks for any help.
Cheers