Sent to a MIDI output device driver to change properties of the output stream.
MMSYSERR_NOTENABLED | The driver failed to load or initialize. |
MMSYSERR_INVALPARAM | The property or property value was invalid. |
MIDIPROP_SET | Tells the driver to set the given property. |
MIDIPROP_GET | Tells the driver to read the given property. |
For a description of the stream properties, see the documentation for the midiStreamProperties function, and the MIDIPROPTIMEDIV, MIDIPROPTEMPO, and MIDIPROPCBTIMEOUT structures in the MIDI SDK documentation
MODM_UNPREPARE