官方 MIDI 规范没有定义读取控件当前状态的机制.但是，许多设备都有特定于供应商的命令来启动批量参数转储.

The official MIDI specifications do not define a mechanism to read the current status of a control. However, many device have vendor-specific commands to start a bulk parameter dump.

是否可以从计算机更改控件是特定于设备的.

Whether controls can be changed from the computer is device specific.