Mike Slinn
Mike Slinn

Sending DAW Output to OBS Studio Using Loopback

Published 2021-11-08. Last modified 2023-09-16.
Time to read: 3 minutes.

This page is part of the av_studio collection, categorized under OBS Studio.

This blog post discusses how to use OBS Studio to capture a live performance on video, using your studio-quality microphones, while enjoying the real-time effects and mixing capability of your favorite DAW software.

You can also use this setup to make a high quality video capture of karaoke, that is, singing along or playing along with pre-recorded music. The recorded music could either be mixed using your DAW, or by providing it to OBS Studio as a Media Source.

Nothing described in this blog post is specific to any particular DAW software; I mostly use Pro Tools and Ableton Live, but Cakewalk, etc. would work just as well with these instructions.

Audio Loopback

No extra software is necessary to send DAW output to OBS Studio and no changes to the system hardware or software are necessary. In particular, no physical or virtual cables are necessary.

All that is required is to configure audio loopback in your audio interface or mixer. This weird name is intuitive to people who understand the concept.

You could think of loopback as a virtual audio cable, connecting an audio output to a virtual audio channel. OBS Studio can use the virtual audio channel as an audio input.

Computer Audio Interfaces

I have an RME Fireface UC and an RME Fireface UFX III, which I upgraded from a Fireface UFX. All of these audio interfaces work with the RME TotalMix software.

I use the RME UFX with my main DAW, and the RME UC with my laptop for mobile recordings.

RME TotalMix provides routing and mixing functions in software for RME audio interfaces. TotalMix works with all RME audio interfaces, including the popular BabyFace. It is available for Windows, macOS, and iPads.

No RME Audio Interface?

If you have an audio interface made by another manufacturer, then you will probably need to use a virtual audio cable, such as VB-Cable or HIFI-CABLE & ASIO-Bridge. Both programs are available for Windows and Mac. Online help for those programs are available on the VB-Audio forums.

Setting Up Loopback in RME TotalMix

The following YouTube video shows how to configure TotalMix to use loopback, but unfortunately the video stops short of actually showing how to work with the routed audio. Read on and I will tell you the rest of the story. It is quick and easy!

Signal Paths

The following diagram shows the important signal paths for this setup.

Step by Step

As shown in the video, set up an unused TotalMix output which will be sent to OBS Studio. Let’s use the AES output for that. The steps are:

  1. Open the AES output channel settings (click on the little wrench icon) and enable loopback, like this:

    If you accidently try to enable loopback on the AES input channel, or the AES software channel, you will not be able to, because the Loopback button is only present on output channels:
    Unfortunately, TotalMix will not show loopback signal at AES input. (Hey, RME, please do something about this!)
  2. In OBS Studio, define a new Audio Input Capture source that captures the output of the TotalMix AES loopback. First press the + button, then click on Audio Input Capture:
  3. I called the new OBS Studio source AES:
  4. To complete the definition of the new OBS Studio source, select the input source whose name starts with AES (RME:
  5. Set the mix levels in OBS Studio.

That is all, you are done! The processed audio from your DAW will now be mixed with the other audio and video streams you set up. I use a Camlink 4K to stream video coming from my Sony Alpha 7 Mark iii camera. OBS Studio mixes all the audio and video streams, and the combined live media stream can be sent to Instagram, YouTube, Facebook etc, and/or it can be saved as an mp4 or mkv. I prefer to save as mkv.

Hot Key

BTW, I set the hot key for recording the mix using OBS Studio to Ctrl-Shift-Z. You can find these settings at File / Settings / HotKeys:

Test Recording

Here is a quick test recording that I made using the above setup, of an extemporaneous composition, while writing this blog post. Notice the echo and reverb effects on the audio; those were added by Pro Tools. I wore headphones so I could listen to the audio without worrying about feedback or adding extra echo.

TotalMix Notes

Read my other notes on RME TotalMix.