One song, every room

You've got a Bluetooth speaker in the kitchen, another on the patio, maybe one more upstairs. Your Mac will only talk to one at a time. Tandem plays the same audio to all of them at once — the whole house in sound, no separate multi-room system to buy.

One master volume rides every speaker together, and per-device trim keeps the patio a touch quieter than the kitchen. Save the set as a preset — “House party” — and bring the whole house back in a tap.

Honest note: each Bluetooth speaker carries its own delay, so speakers of different makes can drift slightly and echo where open rooms meet. Same-model speakers stay tightest, and a little distance between rooms hides the rest.