The new app is now in the App Store.
The name is Reverse Talk and it's quite entertaining. You push the big red record button, talk or make some noise, and then listen to it. You can play it either forwards or backwards.
Playing something backwards really sounds quite different. Those of us who tried to find hidden messages in Stairway to Heaven and other masterpieces, will know what backward talk sounds like. It sounds weird, usually so weird that it's quite funny or perhaps even scary.
You can choose to record for a fixed amount of time, which is 2.5 seconds, or you can record for as long as the device's memory lasts. If the recording is less than about 10 minutes, you can email it to your friends, or to yourself to save it.
The localized app names are as follows:
EN: Reverse talk
NL: Achteruit praten
DE: Rückwärts reden
FR: Inverser parler
Hope you'll buy it and enjoy it. Here is the app's page in App Store.
Update: We have discovered that babies have no need for the Reverse Talk app, because babies already know how to speak in reverse. See http://www.reversespeech.com/Children_Reversals.htm
Their parents, however, might well want to use the app to better understand their babies' reverse speak.
Note: Proctele and reversespeech.com are NOT affiliated