"No two were ere wed but one had a sorrow that never was said" is a traditional Irish saying, meaning that no two people have ever been married without one having an unspoken sorrow that was concealed throughout the marriage.

It's a more romantic idea in the context of the "made match", when both boys and girls were liable to be married off to the person who would make the best partnership with their family farm.

Many's the girl or boy who was married to a 50-year-old next door whose land marched with their parents', so that the marriage would consolidate the two farms. Or to a drunk who happened to be heir to a good business.

As for "din", in the context it is a regional usage for "sound".