Jamout · v1.0.9 Public Beta

Make your own songs playable.

Load a MIDI chart and your own audio stems, pick an instrument, and hit the highway. Everything runs locally in this browser tab.

⚡ Windows + macOS · Local or hosted encrypted songs

Now queued

Select a song

Built-in practice chart · 5 lanes by default · Keyboard mode

PRESS PLAY TO BEGIN

SCORE

000000

COMBO

0×

1×

ACCURACY

100.0%

OVERDRIVE 0 bars

PERFECT

BREAK

HIT WITHDFJKL·Space = overdrive · Enter = pause · Esc = restart

HIGHWAY SPEED 2.00x

Ready when you are. Press Play to start.

Songs

Song nameChoose the title shown in-game and used for your exported .ffsong filename.

Embedded artistSaved with the song so the library can show “Song - Artist”. Several artists? Separate them with commas; each one gets its own filter.

Album cover

Saved in the song file and shown in the song list, while playing and in multiplayer. Square images look best; big ones are shrunk to 640 px.

♫

MIDI chartStandard .mid / .midi file

No MIDI loaded - practice chart is active.

Lane support (saved in the song)

5-lane4-lane

Players only see this song when it matches their Lane mode setting.

▤

Audio stemsSelect several WAV, AIFF, MP3, OGG, or FLAC files* where supported

No stems loaded - practice backing is available.

Automatically convert lossless stems to OGGRuns FFmpeg on this computer to create 48 kHz stereo Vorbis quality 5 VBR (roughly 160 kb/s; actual bitrate varies by content).

Local FFmpeg converter URLRun the Jamout local converter on this computer. Conversion runs locally with FFmpeg; stems are not uploaded to your hosted song server. Only lossless inputs are converted; lossy inputs are kept as-is.

☰

Browse songsSearch the songs hosted on the server

Song library URLAsk the host for this link. It's remembered in this browser.

No song list loaded.

🔐

Password-protected song packageEncrypted .ffsong · MIDI + all stems in one file

Encryption / decryption passwordBy default it's the song name + @200614. The password is not stored in the package or sent to the server.

Auto-generate password from song title + @200614Password is generated from the lowercase title with spaces and punctuation removed, followed by @200614.

Confirm password (when creating)Required only when creating a new encrypted package.

Song preview · 15 s, fades in and out

Made automatically when you create the package and stored inside it, so the song menu’s ▶ button plays right away. Leave empty for the loudest part, or type a start time like 1:05.

Hosted encrypted package URLBest when this HTML is hosted on the same HTTPS origin as your song endpoint. Cross-origin servers must allow CORS.

New packages use AES-GCM encryption with a password-derived key. The password is never embedded in the file and is never sent by the URL loader; decryption happens in this browser. Older v2 self-opening packages embed a recoverable secret and are rejected by this secure build-recreate them from the original MIDI and stems. Encryption protects the file at rest, but anyone who is authorized to decrypt a song can still capture its decoded audio. Restrict server access separately if you do not want people downloading even the encrypted file.

Playable instrument

Keyboard lane assignments

Overdrive

Click a lane or overdrive, then press a key.

Your key layout is saved in this browser.

Chart trackTrack names containing LEAD/GUITAR, BASS, DRUMS, or VOCALS are detected automatically. You can override this here.

MIDI pitch → lane mappingDefault five-lane MIDI notes: 64, 65, 71, 72, 74 map to Green, Red, Yellow, Blue, Orange. Four-lane mode uses 64, 65, 71, 72 only. Velocity 127 is a normal note; velocity 1 is a lift note judged on release. A velocity-127 note lasting about 0.20 seconds or longer is a sustain: keep holding through the tail. Sustains stay visible during the hold; early release briefly flashes the broken tail before it fades. This works in every mapping mode.

Base MIDI note (consecutive mode only)For example, base 60 maps 60–64 to the five lanes.

Ready to shred.
Try the built-in chart, or import a MIDI track to replace it.

Volume

0 STEMS

VOLUME 100%Overall game volume. A gentle soft clipper catches only occasional combined peaks; turn down the master if you hear distortion.

Your imported stems will appear here with individual volume and mute controls.

Sync tip: Export every stem from the same session start, without trimming leading silence, so the audio stays aligned.

Focus mix: The selected instrument stays at its slider level; other playable instrument stems dip by 2 dB; Backing stays at its slider level. Missing a note ducks the selected instrument by 10 dB until your next correctly hit note.

Level tip: Target the combined five-stem sum at -18 LUFS if desired, then apply the same gain change to every stem. Never normalize each stem separately.

A 3D highway. Your keyboard.

Use your configured keys from left to right. Default: D F J K L. The playable guitar role is labeled Lead. MIDI stores note pitches and timing-not keyboard letters. Jamout translates five chosen MIDI pitches into these lanes.

Green · DRed · FYellow · JBlue · KOrange · L

Chart by playing in Logic Pro

Record Musical Typing on separate MIDI/software-instrument tracks named LEAD (or GUITAR), BASS, DRUMS, and VOCALS. Default lane pitches are MIDI 64, 65, 71, 72, 74. Normal notes use velocity 127; lift notes use velocity 1 on the same lane pitch. Lift notes display as a small glowing ring on the note itself and are hit by releasing that lane key.

Stem export starting point

Use stereo WAV, 24-bit, 44.1 or 48 kHz; export every stem from the same start and end; keep track/group FX and intended mix balance; turn normalization off. Do not force every stem to −10 dB or −1 dB individually. See LOGIC_PRO_STEM_AND_CHART_GUIDE.md for details.

Jamout v1.0.9 Public Beta · the 3D highway runs on your device with WebGL. Runs on Windows or macOS. Your music files are not uploaded. Use an up-to-date Firefox, Chrome, or Safari browser; audio format support varies by browser.