better say I was thinking of use in bass guitar 😉
I guess no other way than using as variable resistor, meaning att
so it might still make sense to use simple LDR att to replace passive volume pot in a bass guitar with passive pickups
in that case, what is highest possible INput impedance with LDR att ?
I think a passive bass guitar pickup has 10kohm out, or more
Have I landed in a parallel universe where passive components like an LDR can act like active components e.g. to provide signal buffering? Or have I misunderstood something?
if you saying impedances are no different from ordinary passive att, I would be the one who have misunderstood it all
Maybe its the word 'buffer' which confused me. In RF you can use an attenuator pad to reduce the effect which two things have on each other, so I suppose that could be called a buffer. Never heard it used in this way in audio. Normally a buffer is something like a CF/SF/EF or the op-amp equivalent.
yeah, I got off on the wrong foot, and too fast, thinking there might be a way to reverse the LDR 
maybe I was more like approaching opto/photo signal transfer
probably simpler to just build ordinary SS buffer
I know LarsClausen designed a phono module using photo/opto signal transfer, somehow
but with the high impedances, and added att, one buffer doesn't seem to be enough
optimally two buffers needed, which kind of bothers me
If this goes in any sensible direction the thread title may change
maybe I was more like approaching opto/photo signal transfer
probably simpler to just build ordinary SS buffer
I know LarsClausen designed a phono module using photo/opto signal transfer, somehow
but with the high impedances, and added att, one buffer doesn't seem to be enough
optimally two buffers needed, which kind of bothers me
If this goes in any sensible direction the thread title may change
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