The repository contains official Software Development Kits (SDKs) from Aureal 3D. These were found somewhere veeery deeply on the internet/internet archive. I've stored them here so you don't have to search for them - it wasn't an easy task to find these (at least for me).

• A3D 1.2 API Documentation
• Release notes
• A3D drivers (a3d.dll, A3D.vxd)
• A3D logos
• Code support files (Including CA3DRenderer, CA3DListener, and CA3DSource classes and some more sample applications running A3D with source code available)

• A3D 2.0 API Reference Guide
• A3D 2.0 User’s Guide
• Source code and sample A3D 2.0 applications
• Code support files
• Release notes
• A3D drivers
• A3D logos
• Portable A3D demo
• Aureal Wavetracing technology demo
• Minerva test application
• Marketing presentation
• Vortex audio controller data sheets

• A3D 3.0 API Reference Guide
• A3D 3.0 User’s Guide
• Source code and sample A3D 3.0 applications
• Debug Viewer
• Code support files
• Release notes
• A3D drivers
• A3D logos
• Aureal Wavetracing technology demo
• Minerva test application
• Vortex audio controller data sheets

If you have any other versions, that aren't mentioned here, of official A3D SDKs, please, feel free to contact me.

AFAIK There are versions even before 1.2, perhaps somewhere on the internet even deeper? I don't know. Some of the versions are mentioned inside the release notes inside individual SDKs however, I couldn't find these anywhere on the internet so, if you managed to somehow obtain these, feel free to contribute.