There is no national rulebook for walk-up music. There is a set of conventions every park expects, and a few things a coach can set once for the team. Here they are.
Every park that allows music expects clean versions, and most tournament rules say so in writing. Pick the recording rated clean, not the radio edit, and let a family choose from a list that has already been checked.
The walk from the on-deck circle to the box takes about that long. A song that keeps playing after the batter is set slows the game, and umpires at timed games will ask for it to stop. Trim to the part everyone knows and let it end on its own.
One speaker, pointed at your own dugout and stands, at a volume the next field cannot hear. Music only between batters, never during a pitch. If a park or tournament says no music, that ends the discussion for the day. A coach arguing with an umpire about a walk-up song is a story nobody wants to be in.
Every team on GameDay DJ starts with safe search on, so explicit recordings stay out of the picker unless a coach turns it off, and a coach can block specific songs or artists for the whole team. League-wide rules set once from the console are on the way; the For Leagues page says what a commissioner can run today.
Scan the lineup card, let each family pick the song, tap to play at the field. First team free, and it works with no signal.
It depends on your local league and the park. Ask your commissioner or the park, and expect a clean-lyrics condition wherever the answer is yes.
No. A phone and one Bluetooth speaker in the dugout is the normal setup. GameDay DJ plays the announcer intro and the song from the phone, with no signal needed once the team is locked in.
The family should, and the coach should not have to chase anyone for it. In GameDay DJ a coach shares one link, each family claims their player and picks the song from their own phone, and the coach keeps the final say on game day.