How to interpret Surround Sound settings in FCP X?

I am working on the project using FCP X and am now trying to configure 5.1 surround audio. I am familiar with the way Soundtrack Pro handles surround panning. I am straggling with the new definitions and controls inside FCP X. I hope someone can assist me with this.

1. Sometimes Surround Panner affects Advanced settings and sometimes it does not. What is their relationship?

2. What is Pan Amount relationship to the Advanced settings?

3. Is there a way to set a pack position using numeric values, as it was in Soundtrack (Y,Z)?

4. Questions about Advanced settings

Original/Decoded: Adjusts the balance between the original and decoded signals. The slider can be adjusted from –100 (original signal only) to 100 (decoded center and surround signals only). At 0, the signal is balanced evenly between the original and decoded signals.

What is Decoded signal? By Original do you mean original audio brought into FCP X?

Ambient/Direct: Adjusts the balance between decoded surround and center signals. The slider can be adjusted from –100 (surround signal only) to 100 (center signal only). At 0, the signal is balanced evenly between the center and surround signals.

How does this setting differ from just moving puck (the control)? What does balanced evenly means? Does it mean that 50% of the Original

signal goes to center and 50% to the surround signals?

Stereo Spread: Adjusts the amount of stereo effect from the left and right channels to the center and surround speakers.

How does this setting differ from Attenuate/Collapse setting?

• Attenuate/Collapse: Adjusts the way the panning effect is implemented. At 0, the source signals are attenuated (meaning that the original channel signals get louder and softer
but are not actually diverted to other channels). At 100, the source signals are collapsed (meaning that the original channel signals aren't changed in volume, but instead are moved to other channels in the panning direction).
• Center Balance: Adjusts the balance between the center and surround signals. The slider can be adjusted from –100 (all center signal sent to the surround channels) to 100 (all surround signals sent to the center channel). At 0, the signal is balanced evenly between the center and surround channels.

How does this setting differ from Ambient/Direct setting? What does balanced evenly means? Does it mean that all center signal stays at center and all surround signals stay where they are? Is it the same as Center bias in Soundtrack Pro?

5. Paste Attributes does not work for audio clips with surround?!

6. Sometimes clips loose surround setting after closing FCP X?!

7. Is there way to save surround audio settings as a preset?

Thanks.

James.