Owner`s manual

p.41
Master section
3
Rear panel features
Left, Right and Mono bus inputs
These three female XLR’s are used to bring external signals directly into the
Left, Right and Mono mix buses. This is useful for linking multiple mixers together.
Group 1, 2, 3 & 4 bus inputs
These 1/4” TRSjacks are used to bring external signals directly into
the first four sub groups. This is useful for linking multiple mixers together.