HOLLOW — Space-Horror BGM Generator for RPG Maker MZ & MV

HOLLOW forges original space-horror music — sparse dread and stingers, mechanical industrial grooves, heartbeat stalks and frantic assaults aboard a dead ship, in the spirit of sci-fi survival-horror scores, entirely from scratch in your browser.

Point it at a sector, shape three dials, and it composes and synthesizes an original loop with no samples and no repetition. It's a dev tool: make a track, export it, and drop it into your game. Your loops are original and yours to ship.

What makes it different

• Four fundamentally different forms, so no two sectors feel alike: sparse Dread-and-stingers, a mechanical Industrial groove, a Heartbeat stalk, and a frantic Assault.
• Genuinely unsettling harmony — phrygian, locrian and octatonic, with semitone/tritone clusters that tighten as Dread rises.
• Decay corrodes the mix (detune, metallic clanks, grit); Threat brings stingers, skitters and shrieks; the Form selector forces Drone / Heartbeat / Assault on demand.
• A from-scratch survival-horror rig: dark pads, dissonant strings, cello, heartbeat kick, industrial percussion, hull wind and stingers.

You're in control

• Dread — uneasy → terrifying (dissonance & clusters)
• Decay — clean → ruined (detune, clanks, grit)
• Threat — lurking → attacking (stingers, pulse, tempo)
• Plus Key, Form, and Length.
• Reshuffle rolls a fresh seed — new mode, tempo, form and arc every time. The seed + sliders reproduce any piece exactly.

Ten Sectors

• Derelict — sparse dread & stingers
• Quarantine — sterile dread
• Airlock — vacuum dread
• The Void — cosmic dread
• Reactor — mechanical industrial groove
• Signal — glitchy industrial transmission
• Xenomorph — heartbeat predator stalk
• Vents — claustrophobic stalk
• Breach — alarm assault
• Escape — frantic assault

Export & drop in

• .ogg — game-ready, with LOOPSTART / LOOPLENGTH loop tags baked in. Drop it into your project's audio/bgm/ folder and RPG Maker (MZ and MV) loops it seamlessly.
• .wav — uncompressed, for editing in a DAW.

Good to know

Runs offline in any modern browser — nothing installs, nothing uploads. A short README with full instructions is included. Built with dark and glass pads, dissonant tremolo string clusters, cello, a sub-bass drone, a slow heartbeat kick, industrial percussion (metallic ticks, toms, machine kicks), hull-groan wind, clanks and sudden stingers — all synthesized from scratch.

HOLLOW emulates the style and techniques of sci-fi survival-horror scores; it does not contain or reproduce any existing music, and is not affiliated with or endorsed by any studio or any rights holder.

FAQ

Is the music royalty-free? Can I use it commercially? Yes. Everything HOLLOW exports is original and yours to use in commercial or free projects, no attribution required. A credit ("Music forged with HOLLOW") is appreciated but optional.

Does it use samples or copyrighted audio? No. Every sound is synthesized from scratch with the Web Audio API. It never reproduces any existing track — it emulates a style.

Do the scenes actually sound different, or is it all ambient? They're built from genuinely different musical forms — sparse dread, industrial groove, heartbeat stalk and frantic assault — so the tabs don't share one undertone. The Form selector lets you push any scene into another form too.

Will the loops loop seamlessly in RPG Maker? Yes — export the .ogg. It carries LOOPSTART/LOOPLENGTH tags MZ and MV read to loop with no gap. (The .wav has no loop tags; use it only for DAW editing.)

MZ only, or MV too? Both. They both read .ogg for BGM. Put the file in audio/bgm/.

Can I use these outside RPG Maker — another engine, a video, a stream? Yes. The .ogg/.wav are ordinary audio files; the loop tags are simply ignored by tools that don't read them.

Do I need to install anything or be online? No. It's one .html file — download it, open it in a browser, work offline.

How do I get the exact same track back later? Note the seed shown on screen and keep your slider + selector values; re-enter them for an identical render.

No sound when I open it? Click Play once. Browsers block audio until you interact with the page.

The OGG button says the encoder didn't load. Refresh and retry. Fallback: export the .wav and run ffmpeg -i track.wav -c:a libvorbis track.ogg (no loop tags that way; prefer the built-in OGG export).

Is this "AI music"? The composition and sound come from hand-written procedural DSP code — not a generative-audio AI model. The tool's code was developed with LLM assistance, which is disclosed above.