We have a lot of people who want to use the metal tile roof due to its superior qualities like light weight and strength, but would like to know how if there is a way to reduce the noise of the rain.

The insulating roof blanket is usually 55 mm thick and has a foil base. The blanket is made of thick insulating materials (mineral blanket) and comes in rolls of around 18 sq.m.
It works best when installed on top of the roof battens touching the roofing iron with its fluffy side and foil side looking down. This way it provides not only insulation, but also great noise reduction as well. It absorbs heat and noise acting as a buffer and provides a great and not expensive solution.
Insulating blanket is one of the cheapest products on the market at the moment and is easy to install.
You can find it at www.coroofs.com.au/products
It can be used for the carports as well see at www.easytiledcarports.com.au