Mute key LED not working

[rayshabh]

Whenever I'm trying to mute audio using F6 key, the audio gets muted, but the LED does not blink.

My mute key LED works when switching to in-built audio as sound output via settings, but when I switch to LADSPA plugin equalizer as sound output, the LED does not blink.

System specs:
Machine: Hp notebook
OS: Arch Linux