It works!! Thank you so much!! 
I put a cap between the output of the valve and the next step (I made a picture)
Thank you so much!! I used only 100nF, because I could not find a 1uF, can you explain, what this changes?
And also the bypass switch does not work, but I have to check that again! It only bypasses if I remove the output from the opampā¦ any ideas?
