I want to know what a single sample of audio data (uncompressed PCM) represents.
It is a number, but what exactly is that number and how come it can be converted back to audio?
For example if it is a 4-bit sample, does 0 represent absolute silence and 15 represent max volume?
If it is volume, what frequency are we talking about? How is the information about the frequency stored?
In songs we can hear various instruments (frequencies) at the same time, meaning each frequency is somehow stored in a single sample. How is that done?