Undertone home
undertone. A place for your next idea.

A session, not a finished song.

Find your kind of late night.

Make music with Lyria. Change the feeling as it plays.

Experimental

Tempo and key stay fixed during a take. Stop and start again to change them.

Room to breatheMore movement
VelvetClear

Steering changes the whole mix. You’ll hear the new direction after the buffered audio.

A quiet music studio overlooking water at blue hour, with musical layers drifting across the sky.

Ready when you are

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Checking the Lyria connection…

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Keep what happened.

Your prompt goes to Google. Audio stays in this browser until you download it. Sessions last up to three minutes.

Real AI-generated instrumental audio from Google Lyria RealTime, with SynthID watermarking. One stereo take; individual instruments cannot be isolated. Takes aren’t autosaved. The editable sketchbook is a separate local synth.

Your first sketchMake a sketch to enable sound
Loop

Take the idea with you.

Render your committed mix or carry on editing elsewhere.

No upload. No account. Audio is made on this device.