Grumpy_Mike:
Use 10K pull up and pull down on the analogue input
I think this is the voltage divider part, right?
and couple the audio in with a none polerised capacitor as big as you have got.
- How that capacitor goes here? Between the signal and the input pin (in series), or between the signal and ground (in parallel)?
- Non-polarized capacitor of which type? Because I think a big one is electrolytic