Horacio Mijail wrote a great article about what happens after you actually tag all your songs with BPM... Specifically, how to use BPM while listening on your iPhone?
He says << the only apps I have found that allow me to do this are djay 2 by Algoriddim and Anytune by Anystone. djay 2 is paid. Anytune has a free version - and the pro options look amazing.>> It's a good article.
Horacio also sent to bpmdetection.com some detailed instructions on how to actually go about using Anytune that way:
- tap on the icon to the left of the bottom button bar (it looks like a folder with the Anytune icon on it)
- tap on the + sign
- select "list" to make a list, but the straightest way seems to be to just select "iPod library" from the list under "Import to 'all tracks'"
- all the songs get listed into the "all tracks" list; tap on it to see them
- now you can select the details of the listing: the sorting icon, second from the right, shows you the options. Select BPM so the BPM values are also shown.