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XLR microphones (like the Shure SM7B) deliver audio about 100 ms ahead of your camera’s video. In the Tella Mac app, turn on Delay audio for that mic and set it to about 100 ms. If you record in the browser, delay the mic with Rogue Amoeba’s Audio Hijack, route it into a virtual mic made with Loopback, and select that virtual mic in Tella. Tella can’t realign audio after you record, so set this up before recording.

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Why is XLR audio ahead of my video?

XLR microphones process and deliver audio to your computer faster than your camera delivers video. Typically, the audio arrives about 100 milliseconds earlier. The fix is to add a small delay to the mic audio before it reaches Tella.

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Add an audio delay in the Tella Mac app

The Mac app has a built-in audio delay, so you don’t need any extra software:
  1. Select your XLR audio interface as the microphone in Tella.
  2. Open Settings and go to the Recording tab.
  3. Under Microphone, click Advanced Settings.
  4. Turn on Delay audio and set the Amount to 100 ms.
The delay is saved for that microphone and applies to your next recording. Only add a delay if your audio is ahead of your video. If it’s still slightly off, try 90 or 110 ms.

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Add an audio delay for the web app or Chrome extension

Browser recording has no built-in delay, so use two apps made by Rogue Amoeba:
  • Audio Hijack: adds a delay to your microphone input
  • Loopback: creates a “virtual microphone” that you can select in Tella
Both offer free trials, but you’ll need licenses for long-term use.

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Step 1: Install Audio Hijack and Loopback

  1. Download and install Audio Hijack and Loopback from Rogue Amoeba.
  2. Open both apps. We’ll set them up next.

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Step 2: Set up Audio Hijack

  1. Create a New Session in Audio Hijack.
  2. Add an Input Device Block:
    • Choose your audio interface as the input (e.g., Scarlett 2i2, Apollo Solo, etc.).
    • Remember: you’re selecting the interface, not the mic itself.
  3. Add a Sync (Delay) Block:
    • Drag in the Sync block.
    • Set the delay to -100 milliseconds.
    • This slows down your mic to match your camera timing.
  4. Add an Output Device Block:
    • You’ll connect this to your virtual mic (set up in Step 3).

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Step 3: Set up Loopback

  1. Create a New Virtual Device in Loopback.
  2. Name it something like “Shure SM7B Sync” or “Tella Mic”.
  3. Leave the default settings. It just needs to pass the delayed audio through.

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Step 4: Connect Audio Hijack to Loopback

  1. In Audio Hijack, for the Output Device, select the new virtual mic you created in Loopback.
  2. Run the session. You should see the audio flowing through the delay and into the virtual mic.

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Step 5: Select your virtual mic in Tella

When recording in Tella (or Zoom, Google Meet, etc.), choose your new virtual microphone (e.g., “Tella Mic”) from the audio input options.

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Audio still out of sync after setup?

  • Audio still slightly off? Adjust the delay slightly (e.g., try 90 ms or 110 ms), in the Mac app’s Delay audio setting or in Audio Hijack.
  • Using Audio Hijack? Make sure Audio Hijack and Loopback are running in the background while recording.
Last modified on September 28, 2026