Setting up Key Mapper is straightforwardIt is easier than it looksCloseThe first time you open Key Mapper, the app may look a little more complicated than it is. After installing it, open Key Mapper and look for the Accessibility service prompt on the home screen. Key Mapper lets you choose a button press or combination as the trigger and what should happen when you use it. I turned my volume buttons into custom shortcutsThey became my favorite shortcutsCloseBefore using Key Mapper, my phone's volume buttons had a single purpose: adjusting the sound. The core Key Mapper experience is free and open source, while features such as floating buttons are available as paid add-ons.