USB Interface and stereo system
The diagram above show a USB audio interface.  Audio components/instruments are connected to the USB interface which then connects to the computer via the USB port for recording.  The interface may also have a line output which can be connected to a stereo system.  If not, the computer's line out can be connected to the stereo system or to a set of amplified speakers instead.

Note: Many Computer Audio Interfaces do not have preamps or inputs for phonos (turntables) or live instruments/mics.  Of course you can still record from tape decks, cd players and tuners (radio).  Be sure to read the product's information and specifications.
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