Built this for house parties/get-togethers where everyone has opinions about the music and no one wants to be DJ all night. How it plays: the host starts a session on their own device (phone, laptop, whatever's hooked up to the speaker) and it shows a join code and a QR code . Guests scan it with their phone camera — no app to install, it just opens in their mobile browser — type a name, and they're in. From there guests search a music catalog and queue up tracks they want played. Every...