Quick question .. But when you have effect units hooked up to your aux (reverbe,delay,chorus <aux 1,2 and 3>) and you set the amount of aux on each channel, you don't hear the effects through the buss outputs or sub-group outputs. thats why i stay away from the bus groups and connect the main outs of the mixing board to my recorder. that way i can hear my effects that i used on all the channels during mixdown and then do my final record.
It would be nice it there was a way to let the effects also go into the sub-groups and then i can have better control in doing the final mix.
by the way. i have a mackie 1604vlz mixer. so it has 4 sub-groups faders.