Yes I have seen this section of the Widex web site, thank you but it only explains the technology, and as I said I understand what it does. What I don’t understand is when it is active and when it isn’t. Is it or is it not working when in the Universal Program? Does it only work if in the PureSound Program, which I can’t see or access with my HA at the moment (I currently have access to the Universal and Music programs)? My audi says that the PureSound is one of the sound classes that the HA automatically switches to when most appropriate; is that true or is my audi mistaken?