ORIGINAL: mulligan

Enabling the "Link" function within a particular mix allows that mix to operate other mixes.

For example:

Create a mix from channel 6 to channel 2 (mixing flaps to elevator)
Create a mix from channel 2 to channel 8 (for a second elevator servo)

On the 6-2 mix, if you leave the "Link" disabled, the 6-2 mix will cause the flap switch to operate the elevator servo connected to channel 2 only; the servo plugged into channel 8 will not move (with the flap switch). If you enable the 6-2 mix "Link" function, the flap switch will cause servos plugged into both channels 2 and 8 to move.