I made a little amp to help debug the audio input / processing side, based on the application notes section of the LM386 datasheet. It consists of an LM386, a 9v battery, an old 8‎Ω speaker and a handful of capacitors and resistors. I added a 50kΩ pot for gain control.

And here it is built on a mini breadboard:

It plays Nouvelle Vague just fine.