My sony 650 is wrapped under the tree waiting until Dec 25

so I can't check this myself. Can you play an audiobook at the same time as having an e-book open, and does it slow down the page turns, etc.? The reason I ask is that I have a dyslexic son who uses audiobooks a lot for schoolwork, but I have him read along in the print book whenever possible. It would be great to have both on one device, esp b/c the e-reader text size can be increased, which is a plus for him.