Akai dps24 用户手册

L / R 

Pressing L/R shows this screen: 

This page allows you to route channels to the L/R bus (and hence the master STEREO output). 

All channels (inputs, disk tracks, FX return and group outputs) can be assigned to the L/R bus. 

The options here are simple - off (- - - -) or L/R. 

As with the group assignments, you may find it easier to route channels to the L/R bus using 
the control surfaces dedicated keys.