I would like to speed up my video by the using Sound Keys.. seems logical. But I am kinda stuck here... I need to add an expression to my Time Remapping. But I can't just link it... Does anyone know what I should put there?
I have no idea what you are talking about, but I'm sure you don't need any expression. You should use the Integrate method so the peaks don't fall low again and then it's all just a matter of finding the right values. Of course speed will not increase after a while since their will be no new and higher values. Other than that I think manual keyframing will be much more efficient in this scenario. From my own experience I would also say that expressions might not be very helpful once you go down that road - of all the tasks I can think of, manipulating time this way is the most complicated.