The noise is the same as when you depress the hill descent button and the chiming only stops when the vehicle is static or doing less than 20 mph.
Sounds to me like you need to get the fault codes read.
Also when you ditched the air suspension did you tell the SLABS ECU that the car is now on coils?
What is RAVE? ( which means if I have to ask then probably no! )
Sounds to me like it thinks it is in extended ride height, and is trying to drop out of it above the 'trigger' speed of 18 mph.
Will pop over later on with halwkeye and read the codes, and see if it knows it is on springs?
MW