Track Stacks provide a convenient way to organize and control tracks, to manage projects with high track counts, and to create and manage audio subgroups.

In this video I’m using Summing Stacks to layer multiple synth tracks. When you create a summing stack, the outputs from the subtracks are routed to a bus. The destination aux of the bus is assigned to the main track. When the main track is selected, you can mute, solo, and adjust volume and send levels for the summing stack, and add and edit plug-ins, affecting the sound of all the subtracks in the summing stack.