SilentMode(SilentCamera)
https://play.google.com/store/apps/details?id=com.choco.silentmode

Oneamp Pro - Music Player
https://play.google.com/store/apps/details?id=power.amp.musicplayer.audioplayer

Volume Scheduler Pro - Schedule Volume Profiles
https://play.google.com/store/apps/details?id=com.bhanu.volumeschedulerpro

Protect File Pro -Lock and Send File -En/De Crypt
https://play.google.com/store/apps/details?id=com.protectfile.ProtectFile

Elite Music Pro
https://play.google.com/store/apps/details?id=power.amp.musicplayer.pi.audioplayer