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Beat intensity is how strong the detected beat is. Hip-Hop and Techno music will usually have the highest beat intensity while Classical music will have the lowest beat intensity. It is not the intensity of the music. However, upbeat songs usually have high beat intensity and high BPM. Tangerine tends to be more accurate with the BPM when the beat intensity is higher too.

Tangerine! comes with a set of default rules to filter out tracks that are not suitable for BPM analysis. These tracks include podcasts, audio books, Classical music, and more. Unchecked songs in iTunes are also filtered. You can modify these rules according to your taste in Tangerine!'s preferences.

Tangerine! will never overwrite your iTunes BPM values. In fact it will use iTunes BPM values if present.

The only limitation is that you can't save the BPMs to iTunes.

No. Tangerine! analyzes only iTunes libraries.

This problem happens if your iTunes library is corrupted. You need to recreate your iTunes library so that all tracks are properly saved by iTunes to its library xml file.

Steps:

1. Backup your music library. It's usually located in ~/Music/iTunes (The rest of the instructions will assume that this where it's at)
2. Delete ~/Music/iTunes/iTunes Library
3. Delete ~/Music/iTunes/iTunes Music Library.xml
4. Delete ~/Music/iTunes/iTunes Library.xml if it exists as well
5. Launch iTunes while holding down the option key on the keyboard. iTunes will ask you to choose or create a library
6. Click on "Create Library..." and choose ~/Music/iTunes or whichever folder you want your iTunes library to be at
7. Import all of your songs back in by dragging in the folder "~/Music/iTunes/iTunes Music" into the iTunes window

The reason why you have to do this is because as you keep using iTunes for a long time, sometimes its library file and the library xml file get out of synch with each other. As a result Tangerine! will try to load files from the wrong location. Reimporting the tracks by following the above instructions will correct this problem.

WARNING: By doing this you will lose your playlist, ratings, and other metadata in your library. It is therefore important that you backup your library as instructed in the first step.

No. Currently, there are no plans to release a Windows version of Tangerine!. There is, however, a product by another unaffiliated developer called beaTunes that works fairly similarly.