I've noticed that when the stereo volume is low or on mute there is a strange tinny echo in the cabin when you talk or even if rain drops hit the windscreen. 

 

My suspicion is that this is something to do with the columbus / canton noise cancellation. Has anyone else come across this and if so is there a way of reducing it or turning it off?

Turn off Voice enhancement in the settings. (Used to amplify front driver/passenger voice to people in the back row)

 

Everyone seems to agree though good in theory its carp in practice.

Brilliant! Thanks for the advice. That would have taken me weeks to figure out!

You've got to love this forum.