There is also a competitive product called "Song Surgeon". I don't want to derail this thread into discussion of which is better. Both, I'm sure, will do exactly what you described bcraig4J, that being slow down an audio to make it easier to learn. I do known that Song Surgeon will allow one to slow down the audio to very slow, as in 50%, before the audio gets distorted. Some of the slow down software out there can't do this. That's almost slow enough that I can learn it!

Right now I am trying to learn this one very small section, 6 or 8 notes, of Clapton's solo in "Wonderful Tonight". Thanks to this software I may get it! How did people learn guitar before all these tools?!?!

As an aside, the guy that designed Song Surgeon, James Todd, also has a product called Video Surgeon. Everything that Song Surgeon does with audio, Video Surgeon does with video. And more. I use Video Surgeon more than any other software I have for learning.

You can pick out a section of a video, say a YouTube video you grabbed, loop it and slow it down. You can export that section to an audio file. You can change the key. It will grab that video from YT. go to the link to see all it does.

If I'm practicing I almost always have Video Surgeon running.