I think this app is very useful. As a person who stutters, I use this to help my fluency. It is not 100% effective (of course) but sure beats $4000 for a SpeechEasy device. I researched and a delay of 100 and a frequency of -1 is optimal for when Im on the phone. As a recruiter I use one earpiece and mic while I use my office phone and it significantly reduces my blocks (except for first of sentences etc). I would recommend this to anyone who stutters as another fluency tool!
The only way it could be improved is if it could be used simultaneously with a cell phone call. I mainly use it when making calls on a landline etc. The improvements such as auto mute have been great!!
JeffK1979 about DAF Assistant, v1.4