A solution for some sensors comes courtesy of [Ruslan Nagimov], who shows us how the PC sound card can become a measurement interface. The idea is that simple resistive or capacitive sensors can ...

【USB Sound Card】- External stereo sound card connects ... For better playback sound quality, and providing a powerful solution for Laptops/PC with audio port failures.

Before the AdLib sound card, sound on PCs was in a terrible shape. Since the dawn of IBM, all PCs included a speaker, but this PC speaker was only capable of sounding one note at a time.

Taking considerably less space than digital audio, MIDI files require a wavetable synthesizer on the card, which holds digitized samples of the instruments. See MIDI.