This is just one of over 75 professional audio mixers covered in The Mixer Output Guide, which describes direct outs, inserts, hidden mods and more. To see the rest, and for definitions, visit The Guide.
Direct Out:
1/4", post-fader, pre-mute (internally switchable to be pre-EQ and/or post-mute)
Insert:
Separate TRS jacks, switchable on/off via "Insert" switch (also internal switch chooses pre/post)
Gain Control of Direct Output: