Only the current version so far — new entries appear as the app ships updates.
DAF Pro: Stutter & Parkinson's is a medical app by Speechtools with 5,000+ downloads (about 6.7K estimated). +18 installs in the last 7 days. Rated 2.4 from 130 ratings. Released Sep 18, 2011. Install growth, rank history, SDKs and ad networks.
From the store listing: “Delayed auditory feedback for stuttering, Parkinson's and dysarthria”