EzBlue

Com EzBlue, você pode facilmente ajustar o volume para os seus dispositivos Bluetooth

This app allows you to set the volume level for your Bluetooth devices individually and stores the preset values in its database. You would not need to go through the volume setting process Every time a previously paired Bluetooth device is connected to your android device.furthermore, if your Bluetooth device does not store the volume setting data by it self, this app will fix this issue as well.

Also, if your Bluetooth device volume settings returns to its default settings After going into standby mode or getting disconnected for any reason, this application will automatically set those values to your preset settings.