Everybody plays on it.

Press record. It plays what is already there.

Headphones on, hit record, and the song plays while you're playing. You're playing along, not guessing.

Mute anything. It only goes quiet for you.

Wondering how it sounds without the harmony shouldn't cost anyone their part. Mute it — they'll never know.

• Your takes are yours. Only you can move your levels, and only you can delete them.
• Everyone else mutes. Which is what they wanted anyway.
• Nothing collides. Two people recording at once both land.

Turn the phone. It becomes a desk.

Sideways, the takes line up as faders. Balancing is comparing, not scrolling.

Your take lands where you played it.

Phones are late, and late by a different amount on every phone. Once a song's been through the What it heard, your take gets pulled onto the beat where you played it.

Take it with you.

Export the mix, or every take on its own with the levels written down. Your songs aren't stuck in here.