MCI虽然调用简单，功能强大，可以满足声音文件处理的基本需要，但是MCI也有它的缺点，那就是它一次只能播放一个WAVE文件，有时在实际应用中，为了实现混音效果，需要同时播放两个或两个以上的WAVE文件时，就需要使用微软DirectX技术中的DirectSound了，该技术直接操作底层声卡设备，可以实现八个以上WAV文件的同时播放。-simple, powerful, voice processing documents to meet the basic needs, but MCI also has its shortcomings, it is only once a player WAVE documents, sometimes in practical application, in order to achieve mixing effects, need to play two or more WAVE documents, it is necessary to use Microsoft's DirectX technology DirectSound, and the technology underlying direct audio equipment operation can be achieved over eight WAV files at the same time players.