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I found this little program through one of the forums. It's a neat little package that slows down songs in real time while retaining pitch. Not only that but it gives note suggestions as well. I found that pretty handy.

Very easy to use. you can seperate out a specific part for continuous playback and EQ the song to try and bring the instrument your interested in to the front. I haven't had a good chance to sit down with it but I like what I have seen so far.

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It has a 30 day free trial before you have to buy.