Solved by now, ty all

Well i am not sure i know what u mean.

i know this for example: (but it doesn´t work with the code above beacuse it would add sleep time and break the purpose of the thread)

live_loop :möp do
s = play 50, amp_slide 1, amp: 1
sleep 1
control s , amp: 0

in other words,
how do i control the sample with timed slide options without changing the time of the thread