- In Mixer mode, pressing the button marked Aux on a aux bus will + In Mixer mode, pressing the button marked Show Sends on a aux bus will alter the channel strip for every track or bus that feeds the aux bus. Many aspects of the strip will become insensitive and/or change their visual appearance. More importantly, the main fader of the affected channel strips will now control the send level and not the track gain. This gives a larger, more configurable control to alter the level. Clicking the - Aux button of the aux bus again reverts the + Show Sends button of the aux bus again reverts the channel strips to their normal use.