The audio server is a powerful professional audio service system that can support up to 4 independent channels, each channel outputs stereo sound, and each channel is completely independent. The entire system can be controlled by USB to RS232 or directly by RS232. The upper computer or MCU uses standard serial port code control. The control instructions (including return instructions) reach dozens of lines, covering sequential playback, random playback, and list playback. Various modes, both can specify module operation, and can be operated together. The overall system structure is stable and the function is perfect. It is a very suitable audio server.