OK, I will be working on the assumption the slave eyes are disabled, and there is no other triggering method used than the recivers themselves, and all lights are on and not set to STANBY.
If you select CH1, CH2, or any other CH setting, you can individually adjust that channel, and fire only that channel via the buttons. However, input from the PC cord or hotshoe will trigger all lights.
If you select ALL, all channels can simultaneously be adjusted (and stay in ratio) and triggered via the buttons or the hotshoe/PC jack.
If you select GRP1 or GRP2, etc., the channels assigned to that group can be adjusted together (and stay in ratio to each other) and triggered together from the buttons or the hotshoe/PC.
If only one light is assigned to a group, it will be the same as selecting that one channel, except in the case you want to ONLY trigger that one light for a photo. Whereas having the two key lights in your setup set as a group, they can be adjusted together without having to go to each channel, and making sure they are set the same. Plus, you can trigger them exclusive to the fill light.
It sounds as though you will not want to trigger the keys exclusive to the fill or vice versa. In this case, you will have a group for the keys for simultaneous adjustment, adjust the fill individually or in a group, and select ALL for the actual triggering.
The way I would personally set this up is GRP8 as my two keys, CH1 as my fill, and CH2 and CH3 as my individual key channels. This way, GRP8 (keys), ALL (triggering), and CH1 (fill), are all within 2 clicks of each other, and the keys and fill are each within one click of the ALL setting.
Alternatively, you can have a group for the keys, a group for the fill, and a group with all three lights. This is redundant to what is inherent to the design, but you can put them in whatever order you want.
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