19 - Arrangement Role to Routing Map
Purpose
This page answers "what does this part do?" before you choose a sound — and, just as importantly, tells you when the arrangement is full and which part to cut. It turns the writing concept "one job per part" into a stop-trigger against additive layering.
Every part should fill exactly one role below. Each role has a default source from your palette, a default level/routing, a max count, and a cut rule. The cut rule is the point: when two parts share a role, one of them is bloat.
For the band/depth each role should occupy, see 18 - Frequency and Depth Map. For the named sends referenced here, see 17 - Default Send Rack. To choose the role before the plugin, this extends "Pick the role" in 01 - Start Here.
Main Rule
One part, one role. Before adding anything, name its role. If that role is already filled at its max, you are not adding — you are replacing, and the weaker part loses.
The Roles
| Role | Job | Default source | Level / routing | Max | Cut rule |
|---|---|---|---|---|---|
| Hook | The thing the listener hums | Lead vocal; or mono lead synth (SEM/Diva) | Loud, dry/close, centered; S3 throw on tails |
1 at a time | Two hooks = they compete; mute the weaker or make it a section's hook only |
| Pulse | Relentless forward motion | Drums + an arp/sequence (SH-101, Pigments) | Mid, S1 low; gated with ShaperBox |
1 rhythmic engine | If pulse fights the groove, lower/narrow/simplify — don't add a second |
| Atmosphere | The "place" / harmonic bed | Pad or chord bed (Diva, OB-E, wavestate) | Far/mid, S1+S2, filtered, wide |
1–2 | Two pads doing the same job → keep the better, mute the other |
| Tension | Pressure before release | Drone, riser, filtered noise, dissonant layer | Builds via automation into a moment | 1 per build | Tension that never releases is just clutter — give it a payoff or cut |
| Transition | Moves between sections | Effect-as-arrangement (reverse, throw, sweep, silence) | S2/S3 as automated moments |
1 per transition | If the transition is bigger than the section it introduces, shrink it |
| Vocal support | Frames/answers the lead | Harmony stack, ghost vocal, pad, atmospheric guitar | Wider + wetter + quieter than the lead | 1–2 | Support louder than the lead = it's competing; widen/lower, don't raise |
| Contrast | Breaks the prettiness | Gnarly layer, dirty stab, ugly texture (Trash, S5) |
Bursts only, automated in/out | 1 move per section | A constant contrast move stops being contrast — make it an event |
| Ear candy | Small rewarding detail | One delayed word, sparkle, filtered fragment | Quiet, occasional, panned | 1–2 per section | If every gap has ear candy, none of it is special — thin it |
How to Use It
- Name the role before opening a plugin or browsing.
- Check the role isn't already at max. If it is, you're replacing — A/B and keep one.
- Give the part its band + depth (18) and its send (17).
- When the song feels cluttered, find the doubled role and cut the weaker part first — before EQ, before automation. This is usually faster than mixing your way out.
The mute test from 04 - Make It Sound Expensive is how you find doubled roles: mute a part; if the song doesn't get worse, its role was already filled.
Expensive Empty: a role is enough
A common, expensive move (Lana, Bat for Lashes, Hooverphonic, Mazzy Star verses) is to let one part plus the vocal plus space carry a whole section — usually an atmosphere part (felt piano, Rhodes, or a single pad) holding a verse alone. The restraint is the production.
When you do this, the principle is: don't fill the other roles just because they're empty. An empty role is a legitimate arrangement choice, not a gap to plug. Protect the quiet section so the full one lands harder.
The concrete chain for the keyboard-led version lives as a section in Sound Recipe - Lana Del Rey / Bat for Lashes / Cinematic Electronic ("Expensive Empty"). Use it whenever a verse wants one keyboard and a voice instead of an arrangement.