I imagine that for the sound to be felt by deaf people, they would have neighbours banging on their doors in vain to get them to lower the volume, unless they’re only aiming for subwoofer sounds which begs the question, do deaf people invest in sound systems?
Person 1 has file A, which person 2 wants to download. Person 2 connects to person 1 and starts to download which makes person 1 a seeder. If person 1 has file A but doesn’t seed, person 2 can’t download file A since there is no seeder.
When you seed you make sure that others can download that same file, but yes, they establish a connection with you to download it. If I have understood it correctly.