Routing Mixxx’s Audio to SYQEL

On SYQEL Desktop, pick App Audio: Mixxx in the audio source list. No virtual cable is needed. In the web app, or on a system too old for App Audio, send Mixxx’s output through a virtual audio device instead.

SYQEL Desktop: pick Mixxx directly

1. Play something in Mixxx.
2. In SYQEL, open the audio source list at the left of the top bar. If Mixxx isn’t listed, click the refresh button (↻) next to it.
3. Pick App Audio: Mixxx. The entry uses the name your system gives the app, so it may include a version or edition.
4. On a Mac, the first time you pick an App Audio source, macOS asks for permission. Allow it.

You keep hearing Mixxx as usual. App Audio needs macOS 14.4 or later, or Windows 10 build 19041 or later. On an older Windows build, pick your speakers or headphones instead to capture everything the computer plays.

On Windows, SYQEL hears Mixxx only if it plays through Windows audio. If nothing comes through, open Preferences › Sound Hardware and set Sound API to MME instead of ASIO.

The web app, or an older system: use a virtual audio device

The web app can only hear a microphone or an audio input, not other apps. Send Mixxx’s sound into a virtual audio device, then pick that device in SYQEL.

1. Set up a virtual audio device: BlackHole or Loopback on a Mac, or VB-Cable on Windows. Those guides also show how to keep hearing the music.
2. In Mixxx, open Preferences › Sound Hardware. Set Sound API to CoreAudio on a Mac or MME on Windows, then set the main output (called Master in older versions) to the virtual device (on Windows, CABLE Input (VB-Audio Virtual Cable)).
3. In SYQEL, pick the virtual device in the audio source list, for example BlackHole 2ch, Loopback Audio or CABLE Output (VB-Audio Virtual Cable). The web app adds ”— system audio” to the name.

On a Mac, with Loopback you can instead add Mixxx as a source in your Loopback device and leave Mixxx’s settings alone.

Tip: take the sound from your mixer or controller

If you play through a DJ controller or mixer, you can also connect its booth or record output to an audio input on your computer or audio interface, and pick that input in SYQEL. This works in the web app and SYQEL Desktop, and the visuals follow exactly what the room hears.

If the Input meter at the right of the stage doesn’t move, see Troubleshooting audio detection.