Greetings.
I'm not a professional runner. But I ended here due I own a pair of supernova glide 4 which after 2 weeks of use made POPPING sounds.
I fixed the problem. and I just wanted to share.
On Supernova glide 4.
1. remove both shoes' inner soles.
2. remove the laces.
3. you should now have exposed the inner stitched sole (in my case it's grey and left side has the MI tray. if you pinch it u will notice it's not glued. this is what makes it pop.
4. using a sharp knife, or hobby knife (xacto) cut a D shaped portion of the material that patches under front portion and toes. DO not cut the stitches.
5. be sure the to expose the 3 mounting holes ( they're about the flex line when u walk)
6. Insert the inner sole.
Enjoy SILENT shoes!