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OpenAL Soft, an open source version of OpenAL, is still actively maintained, and can be used by game developers, and to enable EAX sound in older games. Because hardware acceleration for DirectSound and DirectSound3D was dropped in Windows Vista, OpenAL runtime software is required to enable EAX in many games, it still functions in Windows 10, although OpenAL was also discontinued by Creative. These games support EAX 4.0 if audio hardware with an OpenAL-supporting driver is present. Further additions include smooth changes between EAX environment presets and audio occlusion effects (simulating a wall between player and sound source).ĮAX was used in many popular titles of the time, including Half-Life, Doom 3, F.E.A.R., Counter-Strike, and Prey. EAX Advanced HD (also known as EAX 3) and up provide support for new environmental transitions, new effects, and multiple active effects. Each revision of the technology increased the available effects. The original EAX was quite primitive, only offering 26 presets and 3 parameters for more accurate adjustment of the listener parameters and 1 parameter for the sources. However, the EMU10K1's DSP was faster and more flexible and was able to produce not only MIDI output but also other outputs, including the digital sound section.ĭevelopers taking advantage of EAX choose an environment for their game's setting and the sound card uses the mathematical DSP digital filter presets for that environment. A similar effects DSP was also present on Creative's cards back to the AWE 32. The hardware accelerated effects engine is an E-mu FX8010 DSP integrated into the Creative Technology's audio chip and was historically used to enhance MIDI output by adding effects (such as reverb and chorus) to the sampled instruments on 'wavetable' sample-based synthesis cards (which is often confused with the 'wavetable synthesis' developed by Wolfgang Palm of PPG and Michael Mcnabb in the late-1970s, however not related). Up to EAX 2.0, the technology was based around the effects engine aboard the E-mu 10K1 on Creative Technology's and the Maestro2 on ESS1968 chipset driven sound cards. The aim of EAX was to create more ambiance within video games by more accurately simulating a real-world audio environment.

Rather, EAX can be seen as a library of sound effects written and compiled to be executed on a DSP instead of the CPU, often called 'hardware-accelerated'. Ergo, the aim of EAX has nothing to do with 3D audio positioning, this is usually done by a sound library like DirectSound3D or OpenAL. EAX is a library of extensions to Microsoft's DirectSound3D, itself an extension to DirectSound introduced with DirectX 3 in 1996 with the intention to standardize 3D audio for Microsoft Windows, adding environmental audio presets to DS3D's audio positioning.

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