You will need to right click on the Freddy model and select "Add Override Materials".
Then you will need to hover "Show in Element Viewer", then select "Model".
Expand the "materials" tab and find:

mi_microphonestand2
mi_kettle_01
mi_microphone2
kettle_mtl
mic_mtl

Expand each one and right click and hover over "Add Attribute" and select "float".
Then add "$alpha" into the text box that appears.
Then click "Okay". (You will have to do this for each part of the model.)

Now you have no more annoying mic stand! However, that means you wont have a mic stand at all now, which might be what most people want anyway. Have fun with no mic Freddy!