This is sort of an odd question, but I've done a few batches of canning over the last few weeks and don't know if I'm inattentive or if things have changed. Using Ball-brand supplies in all cases. I recall from prior years that using the gold-colored lids, after processing when they cooled and sealed, the "snap" was noticeable -- even if I was in another room of the house, as long as there wasn't much ambient noise, I could hear it and even count to myself as each jar "set". This year I've been using the silver-colored lids, and even though a dozen or so jars so far have clearly sealed (I can feel it running my finger across the top, and I can take the screw ring off and shake the jar upside-down with no loss of seal) I haven't heard a single "snap." The last two batches I've even made a point of being nearby and listening -- although I'm not going to just sit in the kitchen next to the jars for a couple of hours. Is there something different with the lids? Has anybody else noticed this?