Can someone explain the purpose of this buffer stage? I understand how it works in the sense that I understand the cause of each reading on the oscilloscope but I don't understand why the buffer stage is designed this way. The circuit is a five band equalizer.
I thought the purpose of putting a buffer at the beginning of an audio circuit was generally to amplify the signal (I don't think my output is load sensitive) as explained here:
To be clear, the audio input contributes a negligible amount of current so the 12V supply effectively goes through one giant voltage divider which reduces it to 2.4V which it adds as a DC offset to the audio signal which is needed because this is a single supply op amp.
But why would they design the buffer circuit so that the output is REDUCED?
The original design is taken from here where you can see the entire circuit: