Except instead of down games over an internet connection, it only had one-way communication. The satellite would just continually retransmit the same games every few min. When you selected a game to download, the Satellaview would wait for the next transmission to come around and save it to the 1MB flash card.
You could then play the downloaded game more or less like any other cartridge. Many releases were just games that had previously been on retail cartridge.
But some games (these soundlink games) were more of an event. Instead of simply downloading the game, there was a scheduled hour to tune in, and everyone would play the same game in parallel, with roughly the same progression. New game data would beamed down from the satellite continually, bypassing the 1MB limit. Most of this streaming data was CD quality audio, either narration (often live preformed narration) or music, but it could also stream code or graphics too.
I understand it did have some ability to handle multiple tracks of audio, but most of the time the game was designed to work with only one track of audio, hence forcing the players down the same progression based on time.