For example changing the speed of a video clip . There is just nothing that allows you to quickly do that - quickly as in " make decission in one beat of a 120bpm clip and have the speed change at latest at the 4th beat or next downbeat " . For that direct control is absolutely necessary .

Question: What might happen if you try to change the speed of a video clip ?
Answer: None of the above choices .Direct control would n't be necessary and it would be easy .It would be to slow for me to modify .It would be too fast for me to modify .