Steam Audio is available for free to all developers. The latest release is 2.0-beta.3.
© Valve Corporation. All rights reserved. Steam, Steam Logo, SteamVR and SteamVR logos are trademarks and/or registered trademarks of Valve Corporation in the US and other countries. Use of Steam is subject to the Steam Subscriber Agreement at http://store.steampowered.com/subscriber_agreement/