Published in June 1996: https://www.researchgate.net/publication/280323390_The_Effects_of_the_Edinburgh_Masker_on_Stuttering “Results showed that stuttering rate reduced by a mean of around 50% in masking compared tu nonmasking conditions. Only one subject completely eliminated stuttering, and did so in only one of many speaking tasks. Listeners judged masked speech to be less natural sounding than nonmasked speech. it is concluded that. for some clients, there may be some benefit in masked speech by means of the Edinburgh Masker. but that the device does not appear to produce either stutter-free or natural sounding speech.” The article is still OLD; however, there has been little research surrounding the device as it is no longer being manufactured due to updated devices and BETTER research. Please stop pushing an outdated and no longer manufactured device on this subreddit.