Why my slide doesn't work?

Am I missing something?

live_loop :lead, sync: :met do
  with_fx :reverb, room: 1 do
    with_fx :slicer, phase: 0.125, mix: 0.5 do
      with_fx :lpf, cutoff: 130, mix: 0 do |x|
        ##| stop
        control x, mix: 1, cutoff_slide: 10
        use_synth :saw
        play_pattern_timed [:E5, :Ds5, :B4, :Gs4], [1, 1, 0.5, 1.5], amp: 0.7
        sleep 4
        play_pattern_timed [:Gs5, :Fs5, :E5, :Ds5, :Cs5], [1, 1, 0.5, 1, 0.5], amp: 0.7
      end
    end
  end
end

Your lpf is “open” with a cutoff of 130 so no matter what the mix it will sound similar. Try changing the cutoff to 70.