When in Manual mode the power adjustments on the trigger are seen in real time on the strobe. This is not the case for TTL operations. In TTL mode the trigger and strobe act independently. Setting your strobe at -1 and your trigger at +1 will result in "0" compensation. Why is this? The different TTL compensation settings can be useful when setting personal preferences for exposure and refining individual camera and lens combinations to produce more consistent TTL results. If you prefer images exposed to the right (slightly over what you see with no compensation) or in your opinion the images produced with 0 compensation appear darker than you wish, then setting the client strobes to a + compensation should produce your intended results while still allowing +/- 3 power adjustments via the trigger to address the variation of tones in the subject you are photographing.
You can enable both the strobe compensation and trigger compensation to be viewed on the FJ400 (not available on the FJ80, FJ80ii, or FJ200). Go to menu 6 (settings menu) by long pressing the top (menu) button. Press the select button and set the TTL-M option to "ON". Press the menu button to return to menu 1. If in TTL mode you will see 3 numbers. The large numbers are the FJ400 strobe compensation setting. The first set of small numbers is the trigger compensation setting. The third number is the Manual equivalent for the last TTL exposure in group "A" provided you fired the strobe via the camera's shutter.
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