How to fix it: APO Qualizer doesn't work

How to fix it: APO Equalizer doesn’t work

Whether you’re a music lover or an audiophile, if you want to use APO Qualizer on your Windows 10 computer, you may encounter some shortcomings. Most Windows 10 users have found that they can’t use Equalizer on their devices. If you are facing the same problem, then you are in the right place to solve it.

As we all know, some users strive to have full control over the sound on their computers. The main reason for this is that they usually want full control over the sound so that they can adjust it according to their needs. However, if we look at the features provided by Microsoft, the situation becomes more complicated because they are limited in functionality. This is why most people use third-party software, as it allows them to get interesting features.

It also helps them get closer to controlling the sound system. In this article, we discussed some of the reasons why APO no longer works in Microsoft Windows and included some methods to help you easily fix APO Equalizer.

Why does APO Equalizer no longer work in Windows 10?

Why does APO Equalizer no longer work in Windows 10?

Here is a list of some reasons why APO Equalizer may not work in Windows 10. Determining the correct cause of the problem is one of the most important steps in solving it.
Check out the list below!

Disabled Device Extensions – If the problematic device extensions are disabled in their properties, APO Equalizer may not work properly with the device.
Be sure to fix this problem to fix it!

Hardware Audio Acceleration – If hardware audio acceleration is enabled in the device properties, some problems may occur and the equalizer’s APO may not work with the device. Disable hardware acceleration and check if the problem persists.

Blocked by antivirus programs – Antivirus programs may recognize Equalizer’s APO as malicious and some of its functions may be blocked without your knowledge. Be sure to add an exception to the main executable file.

How to repair APO Equalizer?

How to repair APO Equalizer?

Install as SFX/EFX

  1. Press the Windows key and locate the configurator.
  2. Select the APO equalizer configurator.
  3. On the Playback Devices tab, select all the devices you will use with EQ.
  4. Check the boxes next to Pre-mix and Post-mix.
  5. Select the Troubleshooting Options checkbox (use only when problems occur).
  6. Select Install as SFX/EFX (Experimental) from the drop-down menu.
  7. Save the settings and exit the configurator.

NOTE: If you apply these settings and still experience problems with the APO and Realtek EQ sound drivers, go back to the steps, uncheck the boxes next to Pre-mix and Post-mix and try again.

Disable hardware acceleration for audio devices

  1. Open the Control Panel and select Hardware and Sound.
  2. Click Sounds.
  3. Click the Playback tab.
  4. Right-click the audio device and select Properties.
  5. Click the Advanced tab.
  6. Uncheck “All hardware sound acceleration with this device”.
  7. Save your settings and click OK.

Enable all extensions

  1. Open the Control Panel and select Hardware and Sound.
  2. Click on the Sounds option.
  3. Click the Playback tab.
  4. Right-click on the sound device and select Properties.
  5. Click the Extensions tab.
  6. Uncheck the “Disable all extensions” box.
  7. Click the OK button.

Using the Windows registry

  1. Open the Start menu, then locate and open the configurator.
  2. Click the Playback Devices tab and select the device that you want to use with EQ.
  3. Click the Copy device to clipboard command. Open Notepad or a similar application and press CTRL + V to
  4. paste the command.
    Note: Notice the part of the command that is enclosed in brackets. This is the registry key that you are about to change.
  5. To be sure, save your registry according to these instructions.
  6. Press the Windows key and search for Regedit.
  7. Right-click on the registry editor and select Run as administrator.

Determine the correct value

  1. Navigate to the following folder in the Windows registry :
  2. Click on the arrow next to the last key to enlarge it.
  3. Find the name of the key with the line in parentheses from step 4 above.

Change the permissions for this key

  1. Right-click on this key and select Permissions.
  2. Click on “Advanced.”
  3. Click on the “Edit” link.
  4. Enter everything in the appropriate field and click Find Name.
  5. Click the OK button. Under Advanced Security Options, select the Replace owners on sub-containers and
  6. objects check box.
  7. Click Add and click the Select Owner link.
  8. Enter “All,” enter a name, and click OK.
  9. Under Basic Permissions, select Full Control.
  10. Apply the changes and close the dialog box.
  11. Go back to the registry editor and right-click.
  12. Delete the key and restart your computer.
  13. Reinstall the APO using the configurator.

At this point, you need to fix the problems with the APO equalizer and the Realtek sound drivers. If you have tried all these fixes but still can’t get sounds from your PC, you can reinstall Windows.

Frequently Asked Questions

Hardware Accelerated Audio - If hardware-accelerated audio is enabled in the device properties, some problems may occur and APO Equalizer may not work with the device. Disable hardware acceleration and see if the problem persists.

  1. APO EQ settings screen. Open APO Equalizer 1.2 / Configuration-Editor on the Windows start menu.
  2. Equalizer with APO. The equalizer can be applied in the arrow area of the screen below.
  3. Changing the volume with the APO equalizer. You can adjust the gain using the arrows on the screen below.
  4. Use VST with the APO equalizer.

If you are not sure, you can open Start -> Control Panel -> Sound and find the default output device. If you need to install APO on other audio devices later, you can run the program again from C:\Program Files\EqualizerAPO\Configurator.exe.

Peace Qualifier is the Windows computer interface for APO Qualizer In short, Peace is an equalizer and audio mixer for all your PC software on any version of Windows from Vista to 10.


  1. Josef Reply

    The problem with Equalizer APO not working on my PC is that I can’t get the Configurator to work.

    the program was working on my PC fine until recently. It is possible that it stopped working when Windows was updated, but I can’t be certain about it.

  2. josssh Reply

    I’ve also done all these steps and the program runs but doesn’t do anything. It broke earlier this year. is this app dead?

  3. Bradley Reply

    My EQ APO wasn’t working. I discovered it only wants to work if my Filename is config.txt. I have multiple configurations but just save as to config.txt after I load it.
    There might be a setting I’m missing, but this fixes it for me for now

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