I have an MP3 file of a specific song where the instruments are not tuned to 440 Hz. When you play along to this song with a 440-Hz-tuned instrument your playing will sound out of tune.
There is a way to get the tuning of the song using the program Sonic Visualizer (Analysis -> Tuning). For my song I got 448 Hz for example.
Now I want to pitch shift this song so that it sounds in tune. I know that for example Audacity should be capable of this, but which function do I have to use with which values, knowing only the two tunings?