I just posted about an app that implements the DAF (delayed auditory feedback) that you can install on your iPhone or other iOS device [right here](http://www.reddit.com/r/Stutter/comments/18zax5/do_you_have_an_iphone_or_ipad_or_ipod_touch_i/). I'm giving away 10 free licenses. No need to invest $1000+ into a custom hardware solution.