my 2nd amp owned(Akai amu04 or 6) inc. this funky meter/volume ...
That -proprietary- sliding volume device may have looked nice, but was sticky, and become noisy over time.
and it was a long time ago, a young punk, she was luv at first sight ...
phono options, filters (that subsonic was handy then), cool looking peak meters, even a little "amp-clipping" warning (that red led), plus a host of input outputs.
These two replaced a Yamaha receiver ...
Still wish I had that tuner.
opened ...
It even included separate pre out / amp in sockets, bridged by a metal bar ...
in case I needed to mate it with this ...
(all web pictures)