He likes to build bare bones Arduino clones rather than sacrifice full dev boards, and instead of programming them via traditional means, he is using his computer’s sound card. He builds a ...

or if your computer sound card can output four analogue audio signals you could use two stereo amplifiers and two pairs of speakers. You should arrange the speakers in an approximate square and ...

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.