You can export your notes to iTunes over wifi.
1) Connect iPad to computer, open iTunes, select iPad, tap on "Sync with this iPad over Wifi".
2) Tap the Share button in Notability, select iTunes, select notes, select format, select recordings if you'd like, tap Send to iTunes.
3) Your exported notes will appear in the file sharing window for Notability in iTunes. From the Notability side of the file sharing window, you can drag notes on to your computer desktop or another folder on your computer.
Notes will transfer to iTunes, and you can find them in iTunes by selecting iPad in the left column, tap Apps, scroll down to File Sharing and select Notability. Save the notes to your computer. Unzip them, and listen to recordings in iTunes.