PS1 reverb: how it worked and how to get it
The reverb is half of what makes a PlayStation 1 soundtrack sound like one. The console had a single hardware reverb, built into its sound chip, that ran at half the output rate and lived in the same small memory as the instruments. That's why its tails sound dark, a little grainy and very big. Here's how it worked, and how to get the same sound in any DAW with free plugins or with a plugin built on the chip's own settings.
By Aiden Shihadeh, developer of simpleSPU · Published 13 October 2026
Quick answer
| How many reverbs? | One for the whole console. Each of the 24 voices was either sent to it or not. |
|---|---|
| Why it sounds dark | It ran at 22.05 kHz, half the 44.1 kHz output rate, so almost nothing above 11 kHz reaches the tail |
| Settings | Nine documented example settings, from a small Room to Hall, Space Echo and echo effects |
| With free plugins | One reverb on a send bus, a low-pass around 10 kHz before it, no modulation, bass and kick kept dry |
| With a plugin | simpleSPU runs the chip's documented reverb settings at half rate, on its own sounds or on any track |
How the PlayStation's reverb worked
The PS1's sound chip, the SPU, had one reverb unit. It is documented in detail in the psx-spx hardware reference, and a few of its design choices explain most of its sound:
- One reverb, on or off per voice. The chip played up to 24 voices, and each one was either sent to the reverb or kept dry. There were no per-instrument send levels, so a whole song shared one space, which is a big part of why PS1 soundtracks feel so glued together.
- Half rate. The signal going into the reverb was filtered and resampled down to 22.05 kHz, processed there, then brought back up to 44.1 kHz. Almost nothing above 11 kHz survives the trip, so the tail is dark even when the dry sound is bright.
- It shared the sound memory. The reverb's delay lines were stored in the same 512 KB of sound RAM as the instrument samples. A small Room setting used about 10 KB, a Hall about 43 KB and Space Echo about 62 KB. A bigger space meant less room for instruments, so composers traded reverb size against sample quality.
- Simple building blocks. The reverb is a small network of delays, reflections and two all-pass filters, set by 32 register values. It has no modulation, which gives the tail a plain, slightly grainy character that modern reverbs smooth over.
The settings games used
Games wrote the reverb's register values themselves, but Sony's development tools offered a set of ready-made settings, and many soundtracks used them. psx-spx lists the register values for nine of them:
| Setting | Sound memory | What it sounds like |
|---|---|---|
| Room | about 10 KB | A short, close room. Good for menus and action music. |
| Studio Small, Medium and Large | about 8, 18 and 28 KB | Three sizes of a tighter, denser studio room. |
| Hall | about 43 KB | A long, dark hall, the classic sound for towns, churches and slow pieces. |
| Space Echo | about 62 KB | A huge, washy space with audible repeats. Dreamy and very recognisable. |
| Half Echo | about 15 KB | A short room with a slap of echo. |
| Echo and Delay | about 96 KB | Repeating echoes rather than a room. Echo keeps repeating, Delay fades quickly. |
Six steps to PS1 reverb with free plugins
Any DAW's own reverb and EQ can get close. The trick is to copy how the chip was wired, not just its sound.
- Use one reverb on a send bus. Put a single reverb on a return or aux track, set it to 100% wet, and send instruments to it. Don't put reverbs on individual tracks.
- Send at the same level, or not at all. Send pads, strings, choirs, keys, leads and snares at one fixed level, and keep the bass and kick dry. That copies the chip's on or off switch and keeps the low end clear.
- Cut the highs before the reverb. Put a low-pass filter around 10 kHz at the start of the reverb bus. For more grain, resample the bus to 22.05 kHz with a downsampler instead, without adding a bitcrusher.
- Pick a size from the table above. A small room for fast music, a long hall (three seconds or more) for slow, atmospheric pieces. Keep the pre-delay short.
- Turn off modulation and shimmer. Set any chorus, modulation or "spin" in the reverb to zero, and lower the diffusion a little if your reverb has the control. The PS1 tail is plain, and a little rough.
- For Space Echo, add a dark delay. A feedback delay of a few hundred milliseconds, low-passed and sent into the same reverb, gets you close to the washy repeats.
This gets the shape of the sound. What it can't copy is the exact tail: the chip's particular delays and filters, and the way they ring. For that you need the settings themselves.
PS1 reverb with simpleSPU
simpleSPU is a synth and effect plugin modelled on the PS1's sound chip. Its reverb is built from the register values psx-spx publishes, and runs at 22.05 kHz with the chip's documented resampling filter.
- Nine reverb modes: Room, Studio S, Studio M, Studio L, Hall, Space, Echo, Delay and Half Echo, matching the settings in the table above.
- The Space knob sets how much reverb you hear.
- simpleSPU FX, the included effect version, runs any track or bus through the same reverb: drums, vocals, guitars, a SoundFont or a whole mix. That's an easy way to give sounds from other instruments the PS1 space.
- The instrument's presets already play through it, with 4-bit ADPCM samples and Gaussian interpolation, as on the chip.
For the rest of the PS1 sound, from sample rates to the 24-voice limit, see how to make PS1-style music.
Common questions
Why does PS1 reverb sound so dark?
It ran at 22.05 kHz, half the console's output rate. The signal was filtered on the way in, so frequencies above about 11 kHz never reach the tail.
Could a PS1 game use more than one reverb?
No. There was one reverb for all 24 voices, and each voice was either sent to it or not. A game could change the setting between scenes, but not run two at once.
Do PS1 SoundFonts include the reverb?
No. A SoundFont made from a PS1 game holds the samples, not the console's reverb, so it sounds dry and too bright in a normal SoundFont player such as simpleSF2. Run it through a PS1-style reverb, such as simpleSPU FX, to put the space back.
Is there a free PS1 reverb plugin?
The six steps above use only the reverb, EQ and delay that come with your DAW. simpleSPU, which runs the chip's own settings, has a free 14-day trial with every mode.
Is simpleSPU an official PlayStation product?
No. simpleSPU is an original instrument and effect inspired by PlayStation-era music. It isn't affiliated with Sony or PlayStation.