Someone has sent me a CD with a .wav file of some of his work, and it's very faint.

I saved it in iTunes and converted it to MP3, and put it on my Shuffle, but it's so faint that I can scarcely hear it.

Of course, I can play it on the computer, but I'd like to listen while walking by the river.

Is there any easy way to increase the volume of recorded files?

Thanks in advance for all the kind and polite help I know I can expect from Mudcatters.