Brain Jr - Connecting Line-in (audio) to Analog In

I want to get an audio signal on one of the Analog In pins of the Brain Jr so my software can act based on the volume of the audio signal coming in. Has anyone tried this before and how did you connect it? What configuration to use for the Analog In (Pot/FSR/ACC/BTN)?

Wul Btn wouldn't do the trick as it will only be an on/off. I need the full range.

Any help greatly appreciated.

Thanks in advance.

Kind regards,

Desmond