If you are interested, I have recently added twin VU 'type' meters to my web radio running runeaudio. They are very cheap Chinese imports and need a driver. I bought the driver board from the same site. I have connected them to the input side, before the amplifier. This means they respond to the input signal and not the volume control. They are cosmetic and serve no purpose other than I like the retro look.

Let me know if you want more info.