Turn off LEDs


My system is made from a RPI2, with Kali and Piano 2.1.

The system looks like a lighthouse due to the numerous LEDs constantly ON on this boards.

Apart from parasitic light, it’s more the power consumption that concerns me.
I have to admit I still not have implemented a switch off system, because I find user friendly to have it constantly ON and connected. But I think it would be good to take care about the energy

Is there a way to turn off some LEDs when the music is not playing ?