The Twogoodears posted on his blog an fascinating message about LDR volume controls.
I never used them and wonder if it might be interesting.
This volume control uses non-contact optical SS devices to change resistance. There are many devises that vary resistance under different conditions – light, temperature, magnetic field, radioactivity, pressure… etc. I am not convinced that they all only by the fact that they have no physical contact are better for sound. I think in the case of the P&S preamp the quality that Twogoodears observe would derive not from the potentiometers itself but from the quality of the buffers that drive the load after the potentiometers.
Still, it might be interesting to hear the thing…
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche