所で
1
conjunction
by the way;incidentally;well;now
「ところでよ、そのおめーのお父さんはどこにいんのさ?」「横転したトラックの下なんよ」
"By the way, where's your old man?" "Under that over-turned truck."
2
particle · conjunction
even if;no matter (what, where, how, etc.)
after the plain past form of a verb
ぶつくさ言ったところでしょうがない。
Complaining won't change anything.