Total noob audio question

I’m looking to build an HTPC in an old audio amplifier, I have no problem with build itself but I’d like to incorporate the anolog VU meters and the volume control. I currently have the sound detector and redboard in my cart. My question is, will I be able to achieve my goal with these products? Is the sound detector the right product to drive the VU needles? And will the redboard be what is required to manipulate the volume. Any help would be appreciated, thanks.