TA = True Ambience. It's under the premium settings :-) It's bryce's solution to indirect light.

Basically the most controllable way to use it is by turning scene ambience to black, and using the ambient channel on your materials to control the amount of bouncing light. Also, less saturated ambient channel will reduce colorbleeding.

The raydepth is the controller that controlls the amount of bounces of indirect light.
1 bounce (raydepth1) gives darker shadows, and more general contrast but less color bleeding.
6 bounces (raydepth 6) gives a smoother less contrasted solution, more overall indirect light, brighter scene, and more color bleeding, but at increased rendertime.

Unfortunately the raydepth not only affects the amount of bounces of indirect light but also the amount of reflection and refractions made which kind of limits it's use.

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