Lately, I've started digging deeper in the MT and began trying to create my first video scenes (for an upcoming trailer

I would like to create a slow-motion with the MT ingame because my video editing program (Photoshop CC) is limited to a 25% slow-motion.
I did some time speed adjustments and everything works fine (when I move the timeline-red-cursor or when I do the ingame preview). But as soon as I render the video sequence, it goes back to normal speed. I am using the lagarith coder.
Please help me

Greetings,
Soprah