Bus Routing as a Mapping Exercise
Bus routing is where mixes either gain depth or fall apart. The temptation is to create elaborate routing structures: drum bus, guitar bus, vocal bus, parallel compression bus, reverb bus, delay bus, parallel distortion bus. Before you know it, your mixer is a spiderweb of sends and returns, and you cannot hear what is actually happening.
The constraint that clarifies everything: limit yourself to three buses maximum. One for rhythm elements (drums, percussion, bass). One for harmonic elements (guitars, keys, pads). One for vocal elements (lead, backing, doubles).
That is it. Three buses. Every track goes to one of these three. The rhythm bus gets a single compressor. The harmonic bus gets a touch of reverb. The vocal bus gets a slight EQ adjustment. No parallel processing. No multibus routing. Three buses, three simple processors.
This constraint forces you to make real decisions about what each element contributes. If the guitar and the piano both go to the harmonic bus, they have to work together before they get there. You cannot hide them in separate processing chains. They have to sit together in the same space, which means you have to make arrangement and EQ decisions that let them coexist.
The result is a mix that sounds cohesive because everything in each bus is living in the same world. No element feels like it was processed in isolation.