Boost Volume for iPad
There is a neat trick you can do with a book, or other hard surface. (Ideal results are achieved with a concave surface.) Place the iPad speaker facing the book/surface. Some sound will reflect off the book, and join the forwards traveling sound, effectively boosting the volume by a small margin.

Other than that, consider placing the iPad almost touching the microphone of whatever recording device you are using.

(There is probably an app on Cydia to boost volume, but my iPad is not jailbroken, so I am not sure)