Stem Hero 0.2.47

TURN THE SONG INTO YOUR MIX

Your song. Your mix.

Stem Hero is a multitrack music player. It plays separate instrument tracks together so you can rebalance a song, mute parts, or solo the instrument you’re learning.

Clone Hero & YARG songs

Open a song ZIP or a collection ZIP and choose a song. Extracted audio stems from compatible Rock Band and Guitar Hero song conversions also work.

ZIPs are the easiest option on phones. Song and collection folders work where folder selection is supported.

Your own multitrack audio

Load separate OGG/Opus, WAV, MP3, FLAC, M4A/AAC, or WebM audio files. Format support depends on your browser.

Names such as guitar.ogg, bass.ogg, and vocals.ogg help identify the instruments.

What should be in a song?

Start with the song’s separate audio stems. Include song.ini, album artwork, and notes.chart or notes.mid when available for song details and instrument clues.

Use unpacked song assets. Packaged .sng/.yargsong files and console game archives need extracting to a supported folder or ZIP first.

To adjust instruments independently, load separate recordings for those parts. A single mixed recording plays as one track.

Basic keeps the mixer simple. Nerd adds effects and detailed controls.

Your audio stays on this device.

Ready

Audio source

Choose a song/collection folder, ZIP, or audio files

Load a new source or replace the current song.

Open song/collection folder Open Song/Collection ZIP Choose audio files

Drop a song folder or ZIP here or tap to choose individual files

ZIP is the easiest mobile option. Looks for `song.ini` plus recognized Clone Hero/YARG stem names. Files never leave this device.

Experimental low-memory streaming

Off · stable engine
Applies to the next loaded song. Uses browser streaming to avoid retaining complete decoded PCM for every stem; format support and synchronization may vary by device.

Diagnostics 0 events

No diagnostic events.

About this build v0.2.47

What changed

Custom effects keep the preset menu visible above evenly sized, square effect enable buttons.
Basic track cards and fader frames now have square edges and flat surfaces.
All level meters hold measured peaks for at least 40 ms, then fall smoothly over 500 ms from full scale to zero.
A square welcome screen explains Stem Hero, supported song assets, collections, and multitrack audio in both modes.
Basic and Nerd share the same logo, mode switch, and Open New header.
Volume faders require a deliberate horizontal drag. Taps and vertical swipes keep levels unchanged.
Nerd tracks place volume above Mute, Pan, and Solo. Tap a pan or effect knob for a slider; hold and drag for quick adjustment.
Effect slider dialogs explain each parameter. Disabled effect modules keep their settings hidden until enabled.

Known limitations

Streaming remains experimental, off by default, and not described as sample-accurate. Automated recovery can be audible. The stable engine still retains complete-song AudioBuffers.

Keyboard

Space plays or pauses. Home stops and returns to the beginning. Shortcuts are ignored while a control or text field has focus.

License notice

This build contains original HTML, CSS, and JavaScript with no bundled third-party runtime libraries, codecs, fonts, artwork, or songs. No project-wide open-source license has been selected yet. Users are responsible for having the right to use files they load.

Transport

Load a song to begin

Stable engine

00:00.000 / 00:00.000

Mixer

No stems loaded

Master effects Rack bypassed · 0 processors · 0.0 ms

Filter / EQHP · peak · LP

High-pass

Low-pass

Mid freq

Mid gain

Mid Q

Clean compressorGR 0.0 dB

Character

Threshold

Ratio

Attack

Release

Knee

Input trim

Output trim

Approximate level match

Analog colorOriginal soft-saturation models

Model

Drive

Mix

Quality / CPU

Stereo delayBounded feedback

Mode Timing

Time

Division

Tempo

Feedback

Cross-feedback

Filter

Mix

Stereo utilityMono risk · low

Left delay

Right delay

Width

Balance

Link delay times Swap left and right Audition mono compatibility

Stereo modulationMicro-delay pitch motion

Model

Mix

Width

Rate

Depth

Your mixer will appear here. Load two or more stems to test synchronized playback.

INSTRUMENTS

Your song. Your mix.

Clone Hero & YARG songs

Your own multitrack audio

Transport

Mixer

Choose a song

This song may exceed browser memory

Settings affecting your mix

Song notices

Open a song or collection

Pan

Effect parameter