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Drag lanaudio into Applications

Open lanaudio.dmg from your Downloads, then drag the lanaudio icon onto the Applications folder next to it.

Tell your Mac it's OK to open

Open lanaudio from Applications. The first time, macOS says it can't verify it, because we're not in Apple's paid developer program yet. Click Done.

Then open System Settings → Privacy & Security, scroll down to “lanaudio was blocked…” and click Open Anyway. Enter your password and click Open. You do this once.

Set up the audio device

lanaudio offers to add its audio device, called lanaudio. Click Set up audio device and enter your password.

Send on one computer, listen on the others

Sending: set Logic, Ableton or Sound settings → Output to lanaudio, then press Start sending. Allow microphone access when asked: macOS counts reading any audio input as the microphone.

Listening: click the sender's name. In OBS, add Audio Input Capture → lanaudio.