What is the 5/6 Shift switch in the Aux Send section used for?
This switch toggles the corresponding channel’s Aux Sends between 3 and 4 or 5 and 6. This allows you to operate both Aux Sends 3 and 4, as well as Aux Sends 5 and 6 at the same time. This can save you some repatching if you have multiple effects devices for different channels. For example, you could run a set of reverbs on Auxes 3 and 4 for a group of singers, then use a delay and chorus for a guitar running off Auxes 5 and 6. Just hit the Shift switch on the guitar’s channel to move it over to those processors. For these Auxes, only 3 and 4, OR 5 and 6 can be used; they cannot be used at the same time on the same channel.
