The Sound of the Machines
Famicom / NES
ファミコン
The day a triangle wave became a bass line.
Ricoh 2A03 5 channels · Nintendo · 1983
The Chip
Imagine you are a composer in 1984. You sit down to write music for a video game, and you are handed your instruments. There are five.
Two of them are pulse waves — electronic tones with a slightly buzzy, bright edge. One handles melody. The other handles harmony, counter-melody, or whatever the first needs company for. These are your main voices. They have four different timbres you can choose from: sharp and metallic, hollow and airy, or two settings that sound identical but create a subtle texture when layered together.
Your third instrument is a triangle wave. It has a smoother, rounder sound — naturally suited to mid-range notes. But there is no bass instrument in this kit. No bass guitar, no double bass, no low piano register. So you give the triangle wave that job. It cannot adjust its own volume — it is either fully on or completely silent — but you learn to work with that. Silence, it turns out, is its own kind of dynamic.
Your fourth instrument is noise. White noise with adjustable pitch: sharp noise for a hi-hat, softer noise for something closer to a snare. This is your drum kit.
Your fifth and final instrument can play short recordings — a tiny sampled sound. But the rules for using it correctly are counterintuitive, and anyone who gets them wrong ends up with static instead of music.
That is the complete instrument list for every piece of Famicom music ever written. Piano, guitar, orchestra — none of that was available. Just these five voices, together, for everything.
Channel reference (technical)
Tomita's Track
A Song of Ma — The Art of Silence
間（ま）の詩
What to listen for
This piece is built around the Famicom's most unusual constraint: the bass channel cannot change its volume. Instead of getting louder and quieter, the bass gets denser and sparser — and then, at certain moments, completely disappears. Pay attention to bars 8 and 21. At those moments, the bass drops out entirely for a full measure. The silence is not empty. It is the most deliberate note in the piece.
The triangle channel on the Famicom has no volume control — it is either full-power or completely off. So instead of turning the volume up and down, I switched how densely the triangle played: busy playing = loud feeling, one note per bar = quiet feeling, total silence = the loudest statement of all.
How this piece was made
I started with a single question: what does it mean to have no volume control? The Famicom's triangle wave is always at full power. It cannot whisper. The only way to say 'quiet' is to go completely silent. So I built the whole piece around that — density instead of volume. Tight notes for tension, sparse notes for calm, and then complete silence for the deepest expression. Bar 8 was planned from the start: the melody settles on a long note, and at the exact same moment, the triangle drops out entirely. Two silences at once. That is where the Japanese concept of 'ma' — the meaning inside the gap — lives in this piece. The hardest part was the melody. If the melody keeps moving while the triangle is silent, the silence feels like a pause. If the melody also rests at that moment, the silence becomes a room you can stand in.
Techniques used in this track
- Triangle bass density switching: tight (every 2 beats) = tension / sparse (1 note per bar) = quiet / total silence = maximum 'ma'
- Bars 8, 12, and 21: the triangle wave goes completely silent for a full bar — the chip's inability to whisper becomes its loudest moment
- Pulse wave at 25% duty with slow decay (decay=12): the melody fades like a voice trailing off
- Bar 8 echo trick: channel 2 copies the melody at half-volume, 0.45 beats behind — a soft echo in the silence
- Brush snare on beats 2 and 4 only, at low volume — it steps quietly around the triangle's rest
- Each melody phrase lands on a long note, then rests — timed exactly to when the triangle is also silent
Three things about the Ricoh 2A03
The Ricoh 2A03 was not the most powerful chip of its era. Other computers had more channels, better samples, more flexibility. But the limitations that were baked into the 2A03's design — the ones that looked like weaknesses — became the defining characteristics of Famicom music. Here is what the composers were actually working with, and what they discovered inside those walls.
The bass channel had no volume knob — only silence or full power.
The triangle wave — the channel Famicom composers used for bass — could not adjust its own volume. It was always at full power, or completely off. There was no in-between. A real bassist can whisper. The Famicom's bass could only shout or disappear. So instead of turning the bass up and down like a normal instrument, composers learned to control how often the bass played. Pack the notes tightly together and it feels loud. Space them one per bar and the feel goes quiet. Go completely silent — pull out the bass entirely for a whole measure — and that absence lands harder than any note could. What started as a technical limitation became one of the most expressive tools in the composer's kit.
The two melody channels each had four different personalities.
The Famicom's two main melody channels generated pulse waves — but each could be set to one of four different waveform shapes: 12.5%, 25%, 50%, or 75% duty cycle. At 12.5%, the tone sounds sharp and slightly metallic, almost like a brass instrument cutting through a room. At 50%, it becomes hollow and airy, more like a flute or a woodwind. Composers chose the duty cycle based on feel and context — not by reading a manual, but by ear. One small detail: the 25% and 75% settings are mathematical mirror images of each other and sound identical to human hearing. But when both melody channels are set to these two "twin" settings and played together, a subtle layering texture emerges that neither produces alone.
The fifth channel had a trap inside it — and Nintendo knew the trick.
The Famicom's fifth channel could play short recorded audio samples: a drum hit, a voice clip, a crash cymbal. Extraordinary for hardware this simple. But the bit order in which samples had to be stored was the reverse of what most developers would naturally expect. Audio stored the wrong way around played back as garbled static noise. Nintendo's own development teams knew the correct method. Many third-party studios did not — and spent considerable time wondering why their sampled drums sounded broken. The knowledge of how to use channel 5 correctly was, for several years, something of an unofficial competitive advantage.
What the triangle wave taught
There is a lesson hidden inside the Famicom's biggest workaround. The triangle wave was never intended to be a bass instrument. Its natural frequency range, its characteristic smoothness — those belong to mid-range tones. Putting it on bass duty was a compromise made because nothing better was available. A second-best solution to a hardware problem.
But an entire generation grew up hearing that compromise. For anyone who spent their childhood with a Famicom, the triangle wave bass did not sound like a substitute. It sounded like bass itself — the real, correct, definitive version. The limitation shaped the ear. The ear carried the memory. The memory is what makes that sound still feel like something today.
That is what constraints do, at their best. They do not take things away from the result. They give it a specific shape — a shape that could not have existed without the limitation. Specificity is where character lives. And character is what outlasts everything else.
The triangle wave was a workaround. It became the sound of a generation. That is not despite the constraint. That is because of it.
Explore further
Want to hear this chip on original hardware? Browse our tested Famicom collection →