Hi,
After importing your footage into combustion expand the newly created layer in the workspace panel.
Inside the layer you will see a footage operator. Click on this and you will see a tab for the footage controls.
In the footage controls there are two menus. Select the “Output” menu and on the right of the UI you will find the speed controls for the footage.
This tool allows you to change the speed of a clip on a constant, ie: have it running slower.
If you want the same clip to speed up and slow down over time then you would use a plug-in called twixtor or Retimer.
Regards
Grant
DISCREET EMEA