More on focusing on audio versions of text - besides taking notes (even unintelligible notes - just writing something from the audio down enforces it), audacity is also great for audio adjustments and is free. For hard texts, sometimes I close my eyes to better focus, while easy ones I can sometimes get while doing other activities. If a part seems important, go back and re-listen. I always end up with sections that I have heard 5 times and some I only hear once.