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Broadcast music from an app

RoomCast does not capture other apps’ audio by itself. For Spotify, another music app, or DJ software, install the free BlackHole 2ch driver and route the app into it.

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The same steps are on the FAQ music question and in the silent disco guide. Do this before the event.

1. 1

   Install BlackHole 2ch

   Install the free BlackHole 2ch driver and restart your Mac if asked.

2. 2

   Create a Multi-Output Device

   Open Audio MIDI Setup (in Applications › Utilities). Click + and choose Create Multi-Output Device. Tick BlackHole 2ch and your speakers or headphones so you can hear it too.

3. 3

   Choose that output

   In System Settings › Sound › Output, choose the Multi-Output Device (or pick BlackHole 2ch only inside the music app, if it lets you choose an output).

4. 4

   Choose the source in RoomCast

   In RoomCast, open Settings and choose Broadcast music from an app, or choose BlackHole 2ch as the sound source.

5. 5

   Start Broadcasting

   Press Start Broadcasting.

Music coming through? If RoomCast helped, you can buy me a coffee.

You can tweak the volume of each device in Audio MIDI Setup. If you use Spotify or another streaming service, check that subscription’s terms for public or event playback — we cannot advise on what your plan allows.

Quality presets, including Music 96k, are in Settings → Audio. About 50 phones on a modern Wi-Fi router can listen at once. The real number depends on the router, other traffic on the network, distance and walls, and the quality setting. Fifty phones at Music 96k use about 4.8 Mbps of audio.