On the Athan Pro application, you will be offered a multitude choice of azan sounds that you can apply to each prayer.
1. From the app menu, click on the button "Athan Sounds" and select the desired Athan, then click on the "Download" button to save it.
You also have the possibility to listen to the Athan by clicking on the "play" button in front of each athan
2. Once the Athan is downloaded, it must be applied to the desired prayers.