Record audio is needed for this: https://developer.android.com/reference/android/media/audiofx/Visualizer
Read phone status and identity for this: https://developer.android.com/training/permissions/usage-notes see topic Pause media after losing audio focus
Modify or delete the contents of your SD card, this permission is needed to access internal and external SD card memory. It doesn't delete anything on its own.
Modify system settings, needed for these: https://developer.android.com/reference/android/provider/Settings.System