The op wants a passive pre with one input, that doesn’t go to zero, all the ones mentioned above do zero the volume.
As far as I know only the Lightspeed at minimum volume still has a small amount of output, as Light Dependent Resistors (ldr) can’t attain absolute zero impedance.
Quite the opposite actually. Referring to my first post, it can be seen not being able to zero volume, or have more than one input, is not desirableat all.
Both are serious compromises, that designs must overcome.