vimsynth/modules/bus
THE MASTER BUS, as something a cable can reach. Every tab's OUT is summed past the end of the patch graph, so 'the whole mix' had no point in the signal you could patch — this is that point. No inputs; its outputs ARE the sum. Put it in the MASTER area with a chain after it and an OUT at the end, and that OUT becomes the rack's real output. It carries the previous block's sum (1.3 ms), which is what makes it safe. Its signal must never be sent back into a tab.

BUS to get this card.Down the right edge, in the same order.
The full reference — every parameter curve, the patching notes and the worked examples — lives in the manual: docs.vimsynth.com/modules/bus. In the app itself, :help BUS opens the same page without leaving the rack.