Engine sound recordings are usually carried out with multiple microphones aiming at different parts (engine, exhaust, etc.). AudioMotors Surround makes the best use of this usual setups and supports up to 6-channel real-time granular synthesis. AudioTexture Surround also takes recordings up to 6 channels, which is beneficial for surround ambiance sound production.
There is no extra charge for the Surround update. Existing users can download the latest versions from Le Sound's Downloads page.