Echo due to Fx AND the original playback device playing at the same time

Which one was that, and have you tried visiting their support page, subreddit, helpdesk and/or forum?
Because it sounds to me like FxSound did not create this problem, and was working perfectly fine before you installed that other program.

This is a quick copy-paste of my standard list of settings I usually recommend checking first:

  • Make sure your computer, Windows and sound drivers have received all the latest updates;
  • Try completely removing and then re-adding the problematic sound device(s);
  • Try browsing their manufacturer’s website to find and download software built specifically for your devices;
  • In the General section of FxSound’s Settings menu, try changing the setting for automatic switching;
  • Try running FxSound as Administrator;
  • In the Windows Sound Settings menu, make sure all your devices match at the same setting, with “24 bit 48000 Hz” being the maximum supported by FxSound;
  • In Windows Sound Settings, make sure the FxSound device is set as the Default Device;
  • If this doesn’t improve anything, try setting FxSound as the Default Communications Device;
  • In Windows Sound Settings, disable all Enhancements including Loudness Equalization for all devices;
  • In Windows Sound Settings, disable Exclusive Mode for all devices;
  • In Windows Sound Settings, disable Hardware Acceleration for all devices supporting this option (can usually be found in the Advanced tab);
  • In Windows Sound Settings, disable all the devices you don’t need, including the hidden ones;
  • Try downloading the program from a different source and installing that version instead (if you’ve downloaded from fxsound.com, try downloading from the Microsoft Store and vice versa);
  • Try uninstalling with specialized full uninstaller software (not an obligation and more of a last-resort option).
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