Android :: Delayed Auditory Feedback

It's common knowledge among people who are afflicted with stuttering that it helps if you're hearing yourself with a little delay while your speak. This is called Delayed Auditory Feedback (DAF) and makes it easier to speak in a slow and deliberate manner. There are even hardware devices sold for this purpose: http://www.casafuturatech.com/ I've tried one of these devices for a few weeks now. It helps, but it's just one more thing to remember in the morning, one more thing to carry around, and it's pretty large. It's also inconvenient when speaking on the phone. I'd love to develop an Android app for DAF, but I'm not sure if it's possible. A DAF has sound input and output, just like a phone. But instead of hearing another person, the sound input is sent to the output, with an amount of delay (somewhere between 0-200 ms). Is that effect possible to achieve with Android? How would you create the delay? Also, would it be possible to create this effect also when using the phone, so that I hear the other person AND myself with delay?