Now that we've completed the fourth chapter, let's review some of the main tasks you learned to do:
You configured the Raspberry Pi to support the internal audio output device and add-on USB audio adapters
You installed and configured USB sound devices under ALSA
You installed and configured VLC to play Internet-based "radio" streams
You created a Python text interface to automate VLC
You created and modified a fully-featured TKinter interface to implement a stereo Internet radio with a clock
You acquired audio from a microphone connected to the USB audio adapter
In the next chapter, you will start to exercise some of the Raspberry Pi input and output ports to drive LEDs and displays and sense physical switches.