Select the first second of audio and double the volume, then fade the segment out to 50%. Repeat as necessary.
Just be careful not to cause clipping. The best way to deal with that is to bring the entire thing down to 50% before starting.
Here you have a mix created by me of the iTunes sample and the Amazon sample.
https://mega.co.nz/#!3MYT1TSQ!aKX0RAsskESfTdUU7sYMepN2mf_FSyEBGyqB7UAqC1c
