This solution is only for Mac’s. Use the following information at your own risk.
If you have an iPad (I would imagine it is the same for iPhones) and you have recorded something with Smart Recorder (or Smart Recorder Lite) and the iPad has been synced with a system there is a way to successfully recover your audio recordings.
First find your backup location. This will be in /Users/[user_name]/Library/Application Support/MobileSync/Backup/ (replace the [user_name] with your account’s username) and in backup you will have a number of folders with semi-random names. These are your backups. Find the latest one and go to this directory in the Terminal (e.g, cd /Users/[user_name]/Library/Application Support/MobileSync/Backup/).
We will now use grep to find the header of the recordings: grep AIFFCOMM *
The output of the grep search will be the files you want to copy off into a new folder and you can rename them to .aif . These can be tested then with VLC.
You could probably find any other documents in a similar fashion (e.g. for PDFs: grep PDF * ).