Synesthesia in the Mastering Room

When people ask about my mastering work, the conversation often comes back to one detail: I have a form of synesthesia called chromesthesia. When I hear sound, my brain produces an involuntary visual response. Colors, shapes, sometimes movement. Not metaphorically, and not as a way of describing how music feels. It just happens, automatically, the same way another person might recognize a face.

I've had it for most of my life. For a long time I assumed everyone did. I've since learned I'm not the only mastering engineer with it, which makes sense. The profession self-selects for people whose perception of sound is already unusually detailed. This is the article I point people to when they want a more complete answer than I can give in conversation.

What Chromesthesia Actually Is

Synesthesia is a neurological phenomenon where stimulation of one sense automatically triggers a response in another. There are many documented forms. Some people see letters or numbers as colors. Some associate specific tastes or smells with shapes. Chromesthesia, sometimes called sound-to-color synesthesia, is the auditory variety.

I didn't have a name for it until my wife gifted me a copy of Musicophilia by Oliver Sacks. If you haven't read it, Sacks was a neurologist who spent his career documenting the strange and fascinating ways music intersects with the human brain. Reading it was one of those moments where a book just quietly explains your entire life back to you. Oh. So this is a thing. This thing has a name. Other people have it too.

It's not a choice, and it's not something I consciously turn on, or can turn off. It just happens. A snare hit might arrive as a sharp burst of orange squares moving sideways, depending on the reverb trail. A sustained bass note might be deep blue and slowly drifting outward. Bright and aggressive high frequencies tend to show up as white or pale yellow, almost transparent acute triangles. A warm, well-saturated low end is often a dense and heavy amber or brown.

It doesn't look the same every time for every person with chromesthesia, either. These are my colors, my shapes, my movements. Someone else with the same chromesthesia might have an entirely different visual vocabulary for the same sounds. It's personal, relatively consistent, and involuntary. It's just part of how I'm wired.

What a Mix Actually Looks Like

When a mix lands on my desk, the first thing I do is listen. No hands on anything, no notes yet. Just the record. The visual response starts immediately, running in the background while I'm still forming my first impressions of what the mix needs.

A mix with excess low-mid buildup, that common muddiness around 200-400Hz that clouds the body and clarity of a record, tends to look brown and compressed. Congested. Like a room with too much furniture. A mix with too much high-frequency energy is bright and yellow and sharp, almost aggressive to look at. Over-saturated and harsh. Fatiguing visually before it's fatiguing audibly.

A well-balanced mix has space in it. The colors and objects are distinct and not fighting each other. There's clear movement and depth. I can see the elements of the arrangement occupying different visual space, even if I couldn't describe exactly where each one sits.

Over-limited mixes are immediately obvious. They look flat. Static. Boxy. Two-dimensional. Like a photograph with no contrast. The dynamic range, or lack of it, has a visual quality that's hard to miss once you've seen it enough times.

None of this replaces what I see on a spectrum analyzer, meter, or what I hear through my monitors. But it runs parallel to it, constantly, whether I want it to or not.

Does This Mean I Trust My Eyes Over My Ears?

No. Full stop.

Chromesthesia doesn't replace listening. It doesn't replace calibrated monitoring, an accurate room, reference tracks, measurement tools, or the technical foundation that mastering is built on. I'm not looking at a mix and making EQ decisions based on what color I see. That would be bananas.

What it adds is a secondary layer of feedback that runs in parallel with the analytical one. Two data points instead of one. When something feels off in a mix and I'm not immediately sure what it is, the visual response sometimes gives me a starting point, a direction to investigate. It's not always faster. But it's additional information, and in mastering, additional information is rarely a bad thing.

Think of it like this: a seasoned mix engineer develops the ability to hear a problem and move toward it instinctively, before they've consciously named it. That's pattern recognition built from years of focused listening. Chromesthesia functions similarly for me. It's pattern recognition with an additional input running alongside the analytical one.

What It's Like When a Record Really Lands

Most sessions are methodical. You listen, you analyze, you adjust, you listen more, you make decisions. The chromesthesia is there but unremarkable, just part of the background.

And then occasionally a record comes in and it's genuinely breathtaking to experience.

Some mixes produce a visual response that's almost cinematic. Colors that are deep and distinct, movement that corresponds to the dynamics and arrangement in a way that feels coherent and intentional. Those records are different. Those records stay with you even after you've left your desk.

I won't pretend that changes what I do to the record. Those records get the same process as everything else. But it does change the experience of working on the record, and after more than two decades of doing this, I'm not going to pretend that doesn't matter.

Why I'm Telling You This

The job is the job. The work is the work. The records that come through this room get the same process every time, the same listening, the same decisions, the same standards. The chromesthesia runs in the background. Sometimes it surfaces something useful. Most of the time it's just part of how I hear.

That's all this is. Pattern recognition with an additional input running alongside it.