Equalizer APO 1.2.1

Equalizer APO is a Windows equalization program that is implemented as an Audio Processing Object (APO) for the system effect infrastructure introduced in Windows Vista.

Yes, Equalizer APO is open-source software that is distributed under the GNU General Public License v3.0, which means it is free to use and modify for personal or commercial purposes.

Equalizer APO works by intercepting audio data that passes through the Windows audio stack and applies signal processing, such as equalization and filtering, to modify the audio output from a device.

Equalizer APO supports a wide range of filter types, including peaking equalizers, high-pass filters, low-pass filters, shelving equalizers, notch filters, and more.

Equalizer APO supports most audio devices that comply with the Windows audio driver model (WDM) or the Windows driver foundation (WDF), including onboard sound cards, USB audio devices, HDMI audio devices, and more.

Yes, you can save and load EQ presets in Equalizer APO. Presets are stored as text files with an .eq extension, which can be shared with other users or imported to another device running Equalizer APO.

Yes, as an APO, Equalizer APO works separately from the audio application and can be used with any software that uses the Windows audio stack, including media players, streaming services, and voice chat applications.

Yes, Equalizer APO supports multi-channel audio, including stereo, 5.1 surround sound, and more. You can apply EQ filters independently to each channel or use a global EQ for all channels.

Equalizer APO can run on any Windows OS from Vista to 10 (32-bit or 64-bit). It requires administrative privileges to install and a compatible audio device driver to function correctly.

Equalizer APO does not include a GUI by default, but third-party GUI front-ends are available that provide a more user-friendly interface for configuring EQ settings.