Hmmm .......I'm not sure that I've ever considered this as a noise maker or ever heard it while shooting. It seems to me that if a string has to pop back into the groove when shot and in doing so makes noise, the bow has an alignment problem, and maybe a pretty deep and sharp sided string groove.
From what I've learned making a few bows over the years is that a bowyer should first string and shoot a new unfinished bow with no string grooves filed into the limbs. When it has been proved that the string will stay in the center, shot after shot, the string groove is then filed into the limb. I don't see the need to file to deep for this groove because I feel that this groove only helps to keep the string from creeping to one side in the event of unwanted accidental side pressure, weed snags or what ever else we get ourselves into hoisting a bow or setting it down in a bad spot. Only a shallow groove is required. Too deep in my humble opinion only weakens the glass.
A good test on a suspected string groove noise, would be to draw the bow back to full draw, and let it back down as slowly and as straight as you can. The string should track back into the groove. If It won't and you have to "pop" it back in, you have limb alignment problems. You will have to see if the limb twist can be fixed .......a whole diffrent topic.
If the bow is aligned properly the string should fall into the groove silent. I try to keep the loops of my strings as small as possible to aid in consistant string alignment with the grove.
Man........ I ramble too much! Sorry if I insulted anyones intel. My spelling is painfull as well.