8-bit sound effects you generate yourself
Retro game audio uses a small vocabulary: a coin blip, an ascending jump, a descending death jingle. Finding one clip is easy. Finding twenty that sound like the same machine is harder. Soundbox runs open-weight audio models on your own GPU, so you can generate a whole set from one prompt family in one sitting, and regenerate any clip with a different seed when it comes out wrong.
Listen: 14 samples from the 8-bit collection
Every clip shows the exact prompt that produced it. The render script reads its prompts from the same file as this page. Copy one, change a word and generate your own.
Dungeon crawl loop
via audiocpp-stable-audio-3-sfx16-bit chiptune dungeon crawl loop, driving square wave lead synth melody, triangle wave bass synth, punchy 8-bit drum machine percussion, dark minor key, 120 BPM, seamless loop
Boss battle stinger
via audiocpp-stable-audio-3-sfx8-bit boss battle intro stinger, square wave brass stab synth hits, fast triangle wave bass synth run, escalating rhythmic intensity, three phrases building tension, chiptune
Level-complete fanfare (full)
via audiocpp-stable-audio-3-sfxchiptune level-complete fanfare, square wave lead synth melody, triangle wave harmony synth, 8-bit noise-channel drum hits, four ascending musical phrases resolving to a bright major chord
Boss theme loop
via audiocpp-stable-audio-3-sfx8-bit boss battle theme, driving square wave bass synth, fast arpeggiated pulse wave lead synth, noise-channel drum machine on the offbeat, tense minor key, 140 BPM, seamless loop
Menu blip
via audiocpp-stable-audio-3-sfxsingle short 8-bit menu cursor blip, square wave, 80 ms, completely dry, no reverb
Text scroll beep
via audiocpp-stable-audio-3-sfxrepeating 8-bit dialogue text beep, short square wave tick per character, eight ticks in a row, dry
Pixel explosion
via audiocpp-stable-audio-3-sfx8-bit explosion, white noise burst with a fast downward pitch sweep, noise channel, no reverb
Invalid select
via audiocpp-stable-audio-3-sfx8-bit error buzz, low square wave two-tone rejection, harsh, 250 ms, dry
Teleport warp
via audiocpp-stable-audio-3-sfx8-bit teleport warp, fast rising arpeggio of square wave notes then a bright ping, dry
Item get jingle
via audiocpp-stable-audio-3-sfx8-bit item acquired jingle, four rising square wave notes ending on a held high note, bright major key, dry
Pixel footstep
via audiocpp-stable-audio-3-sfx8-bit footstep tick, very short filtered noise burst, low pitched, 60 ms, dry
Boss roar
via audiocpp-stable-audio-3-sfx8-bit boss roar, low square wave growl with noise-channel rasp layered on top, slow downward pitch bend, dry
Low HP heartbeat
via audiocpp-stable-audio-3-sfx8-bit low health warning, repeating two-note low square wave pulse like a heartbeat, urgent, dry, loopable
Save confirmed
via audiocpp-stable-audio-3-sfx8-bit save confirmed chime, three ascending pure square wave tones, clean and bright, dry
Prompts that work
These models respond to physical description. Name the material, the action and the space.
Coin / pickup
short two-note chiptune coin pickup, bright square wave, B5 up to E6, no reverb
Name the two pitches and the interval, or the model returns a generic ping. A coin sound rises.
Jump
8-bit jump blip, square wave rising from low to high over 300 ms, tight and dry
Give the duration in milliseconds. Past half a second, a jump starts to sound like a siren.
Laser
retro arcade laser shot, thin pulse wave sweeping downward fast, narrow duty cycle
"Narrow duty cycle" is the timbre term for the reedy NES lead. It is more precise than "sci-fi".
Game over
chiptune game over jingle, six-note descending minor line, square wave, slow and final
State the direction and the mode. Ascending major reads as a win and descending minor as a loss.
Menu blip
single 8-bit menu select blip, one short square wave note, 60 ms, completely dry
UI sounds usually come out too long. State the length and trim the tail in your editor afterwards.
Making 8-bit sounds that fit
Describe the waveform
These models respond to physical and technical description better than to mood words. "Retro sound" gives you mush. "Square wave, narrow duty cycle, no reverb, 200 ms" gives you something you can drop into a game. Name three things every time: the waveform (square, pulse, triangle, filtered noise), the pitch movement (rising, falling, a named interval) and the space (dry or no reverb; chiptune SFX are almost always fully dry).
Generate short, layer later
A three-second clip is easier to place precisely than a twenty-second one. Most 8-bit effects should be under half a second. Generate them short, then layer and pitch them in your DAW or game engine. A coin and a power-up built from the same square-wave prompt family sit together better than clips from six different sample packs.
Use seeds to get a matching set
Soundbox records the prompt, seed, steps and CFG for every sound it makes and lets you regenerate from any of them. To build a coherent set, find a seed whose character you like, then vary only the pitch and length words in the prompt across the family. If one clip comes out wrong, re-roll that clip and keep the rest.
Why generate locally
The models run on your machine, which changes the cost, the privacy and what you can automate.
Offline after download
Weights are fetched once. After that, generation, the library and the API all work with the network off. Everything lives in one SQLite file and one folder of WAVs under ~/.soundbox, and nothing is uploaded.
Your agent can use it
Soundbox runs an MCP server in the same process, with tools for generating and listing sounds. Generated files come back as absolute paths, so an agent can copy them into a project.
Licences stated up front
Every model's terms are shown before you download it, and non-commercial weights need an explicit confirmation. Soundbox is MIT. The licence of the model that made a sound governs what you may do with it.
claude mcp add --transport http soundbox http://127.0.0.1:17494/mcpcurl -X POST http://127.0.0.1:17494/api/generate \
-H 'Content-Type: application/json' \
-d '{"model":"audiocpp-stable-audio-3-sfx","prompt":"8-bit coin pickup blip","duration_s":1}'Frequently asked questions
- Can I use these sounds in a commercial video or game?
- It depends on the model that made them. Soundbox shows each model's licence before you download its weights. The Stable Audio 3 models use the Stability AI Community License: commercial use is free below USD $1M annual revenue, and above that Stability requires an enterprise licence. ACE-Step 1.5 is MIT. MiniMax's models allow commercial use under a revenue cap and require an attribution notice. Some voice and stem-separation models are non-commercial only. Soundbox itself is MIT, but the audio is governed by the licence of the model that made it. Read that licence before you ship; this summary is not legal advice.
- Does this run offline?
- Yes, once the weights are downloaded. Soundbox runs the models locally and stores everything in one SQLite file and one folder of WAVs under ~/.soundbox. There is no account, API key or upload step. Only the initial model download needs the network.
- What hardware do I need?
- An NVIDIA GPU with 8 GB or more. CPU-only is supported, but each generation then takes minutes. That is fine for a few short 8-bit blips and slow for anything longer.
- Can my coding agent generate these for me?
- Yes. While Soundbox is running it serves MCP at http://127.0.0.1:17494/mcp, with tools for generating and listing sounds. An agent building your level can make the door sound in the same pass and gets back an absolute file path to use in your project.
- How is this different from downloading a sample pack?
- A pack gives you someone else's twelve coin sounds. Generating gives you a coin at the pitch of your menu music and the length your animation needs, in a set that matches. It costs time and a GPU.