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The trickle vents allow air to come into the house for ventilation, and probably don't let much sound through. You can get acoustic vents, which are expensive. its most likely the actual double glazed units that are letting the sound through mostly (as they have the greatest surface area on...

Use a hacksaw blade to cut the foam off, put some silicon down the sides, and put a trim over to cover the gap. The trim would then need siliconing to the frame and the wall.