求助：程序改变录音问题
程序改变可以录音到控制器
键位改变可以录到表达
程序改变支持演奏，录音只能在程序改变栏，表达栏没有东西，这是bug 吗？
求助一下，谢谢！
Help: program change recording problem
Program changes can be recorded to the controller
Key changes can be recorded in the expression
Program changes support playing. Recording can only be performed in the program change column. There is nothing in the expression column. Is this a bug?
For help, thank you!