Routing REAPER’s Audio to SYQEL

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

SYQEL Desktop: pick REAPER directly

1. Play something in REAPER.
2. In SYQEL, open the audio source list at the left of the top bar. If REAPER isn’t listed, click the refresh button (↻) next to it.
3. Pick App Audio: REAPER. 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 REAPER 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 REAPER only if it plays through Windows audio. If nothing comes through, open Options › Preferences › Audio › Device (Ctrl+P) and set Audio system to WASAPI in shared mode 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 REAPER’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 REAPER, open the audio device settings (Options › Preferences › Audio › Device, or Ctrl+P; on a Mac, REAPER › Settings). On Windows, set Audio system to WASAPI and the output device to CABLE Input (VB-Audio Virtual Cable). On a Mac, set the output device to the virtual device.
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 REAPER as a source in your Loopback device and leave REAPER’s settings alone.

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