Free virtual Synthesizer

Play a browser synthesizer and explore oscillator waveforms, filter controls and ADSR. Make sound; no credits required.

Synthesizer

Oscillator

Filter

A
D
S
R

Focus the instrument before using the displayed keyboard shortcuts. Focus the keyboard, then play with A W S E D F T G Y H U J K O L P ;. Release a key to stop the note.

Change one control at a time

Waveform sets the starting tone. Filter and ADSR change how that tone moves, not the written notes.

Daylit music production workspace

Start with the shape of a wave

Compare sine, triangle, sawtooth and square waveforms while keeping the same note. Each offers a different harmonic starting point.

Use
Headphones and a recording desk

Hear how a sound changes over time

Adjust the filter and ADSR envelope. Attack, decay, sustain and release shape the note rather than changing the written melody.

Use

Turn a little theory into something you can hear

  1. Choose a waveform

    Start with a low volume and one oscillator waveform.

  2. Play a note

    Use the on-screen keys or displayed keyboard shortcuts.

  3. Shape and compare

    Change one filter or envelope control at a time, then stop all sounds when finished.

Use

More free audio tools

Keep practicing tempo and pitch in the same session.

Explore Tools

Start from harmony and instruments

Hear a key, play a shape, or try a voicing in the browser before you take it back to your track.

Free interactive music tools

What creators say about Viralkey

See how creators use Viralkey for their music videos.

JM

Jason Mitchell

Indie Musician

One portrait plus my track — a performance-ready AI MV in 3 minutes.

Short-form for the next release finally keeps up.

GF

Grace Fox

Label Manager

Same face, different style — the team gets a new visual direction without reshooting or rebuilding the concept.

EW

Emma White

Electronic Musician

Upload a song and AI builds around rhythm and emotion — drops and energy shifts land in the picture.

MC

Mia Chen

Producer

No shoot crew.

Upload the track and get a release-ready AI music video in minutes.

DM

Diego Martins

Musician

Lip-sync and expression actually feel like singing — not a mismatched face track.

Viewers feel the emotion land.

HP

Hannah Parker

Label Manager

Same face across performance, story, and VFX, then 100+ styles on top — series posting finally scales.

RN

Ravi Nair

YouTuber

TikTok needs hooks and watch-through structure.

Viralkey clips can stop the scroll in the first seconds.

YL

Yuki Lin

Creator

Scenes and looks change, but the face stays the same — no face drift, consistent character at last.

LS

Leo Santos

Creator

Ship on release day: image to music video or song to music video — both modes cover what I need.

A few things worth knowing

Attack is the rise to peak level, decay is the move to sustain level, sustain is the held level, and release is the fade after letting go.

Give the idea a sound

Start small, listen closely and try one change at a time.

Use