USB序列号字符串被识别为两个USB音频设备

嗨，伙计们，我想用CY8C32 xx做一个USB声卡，我已经完成了ServalPCBAS。但是当我在不同的OS上测试它们时，出现了一个问题。
当我将两个PCBAS插入到PC（Windows 10）中时，它们可以被识别为两个USB音频设备，但是在MAC中只有一个USB音频设备被识别。我发现原因是，当我配置了UBFS时，序列号串的选择i选择了用户输入的文本（附加1）。EXT I将这个选项修改为硅生成序列号，问题解决了。但是我有一个难题，当我将两个PCBAS插入到PC机中时，将有一个带有设备描述符的数字前缀（附加2）。该数字不是随机数，与插件的顺序无关。现在这个数字是如何产生的？如果我想按***入的顺序创建数字，我能做什么？
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     以下为原文
  Hi guys,i want to make a u*** sound card with CY8C32XX,and i have completed serval  PCBAs.But when i tested them on different OS,there was a problem.
    When i plugged two  pcbas into a PC(WINDOWS 10),they could be recognized as two u*** audio devices,but into mac just only one u*** audio device was recognized.I found the reason some time later,it was when i configured USBFS the option of Serial Number String i selected User Entered Text(attached 1).Next i modified this option to Silicon Generated Serial Number,the problem was solved.But i have a puzzle with it,when i plug two pcbas into a PC, there will be a number prefix with the device descriptor(attached 2).The number is not  a random number and is not related to the sequence of being plugged.Now how this number is created?If i want the number is created in sequence of being plugged,what can i do?

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