This solution would call for multiple sound output devices (on many systems, programs such as Festival and MPlayer can direct the output to a specific device) or coordinated input to one device.
Device drives are specialized programs that allow particular input or output devices to communicate with rest of the computer system.
设备驱动器是专门的方案，允许特定输入或输出设备进行通信与计算机系统的其余部分。
3
If we worked only with digital devices, we would eventually have to convert the output of the digital device into analog form if we wanted to input it into a computer.