I found the solution using this expression.

((thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider")/45)*thisComp.layer("speed slider").effect("Slider Control")("Slider"))+time


thanks!!

i have a pre comp layer video with this expression on time remap

thisComp.layer("SK 02").effect("Sound Keys")("Output 1")

My question is how can i play my video in normal speed and active/deactive my expression (time remap) when i want???