I must confess this is a kind of advert. I have invented a humble device that facilitates speech through a CPAP type mask. It is typically used by those that require some form of ongoing respiratory support due to acute respiratory problems such as Motor Neuron sufferers, etc). So if you know of someone who could benefit from having a chance to communicate with loved ones at a crisis point in their lives, please share this post with them. I haven't included a URL, but please web search 'HiSpeak' for pictures and testimonials. Many Thanks, Mike O'Kane.