系统 初级教程 使用API函数beep播放数字声音，该函数通过硬件主板播放声音，而不是内部的声卡。-System primary tutorial uses the API functions beep play digital sound, the function through the hardware motherboard playback sound, rather than the internal sound card.

对声卡的实实录制 对外部声音处理不是很全面有杂音-Record real sound card external sound processing system is not very comprehensive murmur