Audio Signal Switcher

Correction: I meant to say "1 of 2 paths", not "1 or 2 paths".

Use NPN and PNP transistor in the place of LEDs. It will work.

How exactly should the transistors be configured?

Hi, you can use a CD4051 analog multiplexer to switch the audio, but it will add a little bit more cost to your BOM.

Audio signal flow is the path an audio signal takes from source to output.The concept of audio signal flow is closely related to the concept of audio gain staging; each component in the signal flow can be thought of as a gain stage.

In typical home stereo systems, the signal flow is usually short and simple, with only a few components. However, in recording studios and performance venues, the signal flow can often be quite complicated, with a large number of components, each of which may cause the signal to fail to reach its desired output. Knowing each component in the signal flow becomes increasingly difficult and important as system size and complexity increases.

What about using two photocells? Glue each photocell to each LED. Use black heat shrink to separately cover them from light. Wire the circuit so that the left audio signal must go through one photo cell and the right audio signal must travel through the other photo cell.

Then it is a good solution to try. How you conencted? DO you have schematic?