MusicTechHelpGuy shows how bus processing turns a vocal summing stack into a glued, polished group in Logic Pro 11. Instead of tweaking each vocal track separately, he stacks three effects across the whole group: saturation, EQ, and compression.
First comes ChromaGlow for tape-style saturation. He pushes the drive well past taste, bypasses the low end so it doesn't get muddy, then dials back the wet/dry blend to control how much grit actually lands.
For extra top-end sheen, he skips the stock Channel EQ in favor of the Vintage Tube EQ, using its high boost to add air without harshness.
Last is a light touch of Vintage VCA compression, modeled on an SSL-style bus compressor. The goal isn't obvious squash, just enough gain reduction to shave off rough edges and make the stack feel like one cohesive vocal, with an optional wet/dry blend if the compression feels too aggressive.