Does the studio remix hidden songs or generate audio directly?

No hidden library or audio model. Each note traces to a persisted Jev Choice decision, a labeled fixture, or a manual edit, with fixture output badged in the interface and provenance field.

How much API usage does one composition cost?

One request per lane-bar plus planning overhead, so a mid-size piece costs dozens of calls. Develop and test in fixture mode with zero credits and reserve live mode for real compositions.

Can I edit notes without spending more model calls?

Yes. Piano-roll edits, tempo, swing, instrument, mute, transpose, locks, undo and redo are deterministic and model-free. Natural-language revisions and region regeneration are the parts that call Jev.

What does the workflow look like from prompt to MIDI export?

Run the local server, compose by prompt, poll the resumable job with pause and keep-or-discard control, then play in the browser and export project JSON or Standard MIDI. Jobs survive restarts.

How does the composition pipeline work?

A prompt becomes a plan (meter, tempo, form, lanes), then instrument choice, harmony, phrase intent, per-lane groove parameters and complete-bar patterns, each one Jev Choice call, and code renders every pick into notes. A bounded rolling context of recent bars, motif and harmony plan is resent at each step.

What do I need to run it, and how do I avoid spending credits?

Node 22.16 or newer. Fixture mode needs nothing and returns deterministic synthetic decisions; live mode needs a TYPESAFE_API_KEY and spends roughly one request per lane-bar plus planning, about 75 to 80 for a 16-bar four-lane piece. npm test runs on fixtures with no credits.

Where is my data and key stored?

Everything lives under app/data/ as SQLite plus settings. The API key is stored in app/data/settings.json at mode 0600 or supplied through the environment, is never served to the browser and never appears in exports, and fixture output is labeled fixture in generation.provenance with a badge in the UI.

CommunityJev Tools & CLIs

Jevthoven

Prompt-first symbolic music studio where a live Jev model decides plan, instruments, harmony, groove, and each bar, rendering every pick into an editable multitrack piece.

See highlights

Open github.com

Stars: 15
Language: TypeScript
License: MIT
Published by: Community
Author: cocktailpeanut
Last verified: Oct 2026

cocktailpeanut/jevthoven

User repository on GitHub

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AI Music (MIDI) generator powered by Jev

Forks: 3
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.

About this project

Prompt-first symbolic-music studio. Describe music in one sentence — "a wistful 3/4 waltz, soft keys over round bass, light swing" — and a live TypeSafe Jev model decides every musical unit, sequentially, with a bounded rolling context (recent bars, motif, harmony plan) resent each step. The result is an editable multitrack composition you can play, reshape, and export.

Quoted from the project's README. Read the full README.

Tagscommunity jevbest catalog-import

Works forJev for Classification

Used inJev for Software & DevTools

Languages: TypeScript

Highlights

One sentence becomes meter, tempo, form, instruments, harmony, and bar patterns via sequential Jev Choice calls.
Bounded rolling context of recent bars, motif, and harmony plan is resent at each composition step.
React piano-roll studio with Tone.js playback, resumable jobs, deterministic edits, and MIDI plus JSON export.
Fixture provider gives deterministic synthetic decisions for tests; SQLite persists projects and job state locally.

Watch out

Live mode spends roughly one request per lane-bar plus planning, so use deterministic fixture mode for development and tests. Copy reviewed against the repository README on 2026-10-04, not from running it.

Questions about this entry

Short answers drawn from the linked project or page.

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