| Microsoft DirectX 8.1 (C++) |
By setting the GUID_DisableTempo and GUID_DisableTimeSig parameters on a track, you can disable the setting of tempo and time signature by a control segment. You might want to do this, for example, when you have set the tempo dynamically and don't want the primary segment to send tempo messages.
To re-enable the parameter, call one of the set-parameter methods with GUID_EnableTempo or GUID_EnableTimeSig as the rguidType parameter. You can also set these parameters to force a segment to send tempo messages even though it isn't the control segment, or to cause a secondary segment to send time signature messages. For more information, see Control Segments.
For more information on how to set a parameter, see Setting and Retrieving Track Parameters.
See also the Remarks for IDirectMusicTrack8::IsParamSupported.
It is also possible to disable and enable any track parameter by setting the configuration flags on the track. For more information, see Track Configuration.