This message is sent by a MIDI input driver to a client application when a MIDI event other than a system-exclusive event is received by the device.
DWORD dwParam1
Specifies the MIDI data that was received. The message is packed into a DWORD with the first byte of the message in the low-order byte.
DWORD dwParam2
Specifies the time that the message was received by the input device driver. The time stamp is specified in milliseconds, beginning at zero when the driver received the MIDM_START message.
There is no return value.
The driver should generate a status byte for events received with running status.