| Track type | Tempo. |
| Purpose | Set or retrieve the tempo. |
| Data Type (*pParam) | DMUS_TEMPO_PARAM. For SetParam, the mtTime member of the structure is ignored. For GetParam, the mtTime member will receive the offset of the tempo change from the requested time, and will always be 0 or less. |
| mtTime | The time, in track time, at which to set the tempo, or at or directly after the tempo change to retrieve. |