unity3d – I want a pattern texture to appear in the desired area at the desired time on top of the scrolling empty texture in the unity shader graph

I want to use a boolean node in shadergraph on the scrolling empty texture so that when it is turned on, the pattern texture appears, and when it is turned off, the empty texture appears again. I want the pattern texture to appear freely depending on the state of the boolean node. When the node is on, the pattern appears, and when it is off, the pattern does not appear. Is there a way?

I hoped that the clamped texture would appear at the desired timing, but I couldn’t do that.enter image description here