1. Download a DAF App from the App Store or the Play Store. We are currently in the process of developing our own app, so in the meantime, feel free to try the alternatives. 

2. Whilst the app is downloading, put your phone aside and start reading a page out loud from a book, in front of ideally multiple people (make sure you do this without using the app). 

3. Now, open the app and plug some earphones (make sure they have a microphone) into your phone and open up the app. Go ahead and alter the settings to a 70-millisecond delay and a half an octave (+3) increase in pitch. Then, try and read the exact same page that you read before out loud again.

Hear the difference?