> > - average or peak or both (only with LED possible)
>
> Some knowledgeable about audio engineering needs to chime in on

this

> one. What do the VU meters on standard mixing desks usually display

Moving coil VU meters only supply accurate average information due to
the mechanics of the device... or so I was told 100 years ago when I
was an assistant engineer.

You'd need something like LEDs to get accurate peak information.

Regards,
Kevin