Audacity Error opening recording device, 9999 Unexpected host error

Audacity is a popular and free digital audio editor and recording application. But when using it on a Windows PC, users have reported encountering Audacity Error opening recording device, 9999 Unexpected host error. If you have this problem, this article will help you.

The problem occurs when you try to record something on a Windows PC. Luckily, like any other problem, it can also be eliminated with a few simple fixes. Let’s check them one by one.

What causes Audacity error code 9999 Unexpected host error?

Audacity returns error code 9999 Unexpected host error when trying to record something on the application. There are several reasons behind the culprit. Some of the most common are listed below.

  1. The problem in the question will occur if Audacity is not allowed to access the microphone.
  2. If another audio recording application is running in the background of your system, then you will most likely encounter the problem.
  3. Various third-party anti-virus programs can interfere with the proper functioning of Audacity and cause problems.

Now that you have prior knowledge of the various reasons behind the problem, let’s see how to fix them.

Audacity Error Code 9999 Unexpected Host Error

Here are all the effective solutions to try and get rid of Audacity Error Code 9999 Unexpected Host Error.

  1. Restart the app
  2. Allow app to access microphone
  3. Close similar apps
  4. Set microphone as default device
  5. Disable third-party antivirus software
  6. Fix problems in Clean Boot

Now let’s see all these fixes in detail.

1]Restart the app

Before trying any of the technical solutions below, the first step you should take is to restart the application. In fact, for most users, the problem resulted from a temporary glitch and was resolved upon restarting the application. So, restart Audacity and check if it fixes the problem. If so, you are good to go. But if the problem still persists, try the next solution on the list.

To see: Fix Audacity FFmpeg Error on Windows PC

2]Allow app to access microphone

Enable microphone access

As mentioned, one of the main reasons for the problem in question is that you have not authorized Audacity to access the system microphone. You will need to allow Audacity to access the microphone to resolve the issue. Below are the steps to resolve the issue.

  1. Open Settings by pressing Windows + I hotkey.
  2. Click on the Privacy and Security options present on the left panel of the screen.
  3. Click Microphone.
  4. In the next window, enable the toggle present next to Microphone Access.

That’s it. Now restart your Windows PC and launch Audacity. Check if you still encounter the error message when trying to save.

To see: Fix Audacity FFmpeg Error on Windows PC

3]Close similar apps

Another main reason behind the problem is similar apps running in the background. It turns out that different apps with Audacity-like functionality running in the background can cause the problem in question. You will need to close all these apps to fix the problem.

To be very precise, the problem comes from applications like Skype, Zoom or Google Meet. So, open Task Manager > Right-click on Audacity-like applications > Click End Task from the context menu. Once the process is complete, launch the app and check if the issue still occurs. If so, try the next solution on the list.

4]Set microphone as default device

The next solution on the list is to set the microphone as the default device. Below are the steps to do so.

  1. Open Settings.
  2. Go to System > Sound > More sound settings.
  3. Go to Registration tongue.
  4. Select the Microphone.
  5. Click on the Define by default option.
  6. Click Apply > OK.

Launch the app and check if the issue is resolved.

5]Disable third-party antivirus software

Various third-party antivirus programs can interfere with the proper functioning of Audacity and cause the problem in question. As a solution, disable any such application installed on your system and check if it solves the problem. If so, then you know what is causing the problem. From next time, temporarily disable this application before running Audacity.

Lily: How to split and merge audio files using Audacity under Windows

6]Troubleshoot problems in Clean Boot

If none of the steps were helpful, you can consider clean boot troubleshooting. The system boots with a pre-selected minimal set of drivers and startup programs in the clean boot state. So, troubleshoot in Clean Boot and check if that fixes the problem.

How to Fix Unexpected Host on Audacity?

One of the best ways to eliminate an early host error on Audacity is to rescan audio devices. You can do this by opening Audacity > Click Transport, then Rescan Audio Devices. Wait for the process to complete and check if it fixes the problem. If not, you’ll need to double-check Audacity’s settings.

Read more : Reduce or remove background noise using Audacity for Windows PC

Fix Audacity Error Code 9999 Unexpected Host Error

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