Sound Lab (beta) · Aura Radio
Aura Sound Lab: four sound toys for your browser
Four toys in one place
Everything here is free, runs in your browser and needs no account. The interface of each toy is in Spanish for now.
- Spanish
Auditory illusions
Twelve sound experiments that fool your ears: sounds that do not exist, melodies that climb forever, rhythms that speed up for ever.
- Spanish
Solfège games
Twenty-one games for learning to read music, with a piano on the screen. They include flamenco rhythm patterns and classical melodies.
- English guide
Piano and synthesizer
A free keyboard with a simple mode for learning and a pro mode with filters, effects and recording.
- Spanish
Play along with the radio
A keyboard that estimates the key and tempo of the live Aura Radio stream and marks the notes that fit.
The twelve auditory illusions
Each one is a short experiment with a control or two. “Required” means the effect only works with headphones.
| Experiment (Spanish title) | What it is | Headphones |
|---|---|---|
| El tercer sonido | The third sound: combination tones (Tartini tones) | Recommended |
| La nota que no suena | The note that is not there: the missing fundamental | Not needed |
| La escalera infinita | The endless staircase: the Shepard–Risset glissando | Not needed |
| El latido que no está en el aire | The beat that is not in the air: binaural beats | Required |
| El que llega primero manda | The first to arrive rules: the precedence effect | Recommended |
| Lo que suena no es lo que oyes | What plays is not what you hear: the octave illusion | Required |
| Sube o baja, depende de ti | Up or down, it depends on you: the tritone paradox | Not needed |
| Una nota escondida en el ruido | A note hidden in noise: the Huggins pitch | Required |
| La nota que deja el silencio | The note silence leaves behind: the Zwicker tone | Not needed |
| El tono que no se interrumpió | The tone that was not interrupted: auditory continuity | Not needed |
| El ritmo que acelera para siempre | The rhythm that speeds up for ever: the Risset rhythm | Not needed |
| Dos melodías donde hay saltos | Two melodies where there are leaps: the scale illusion | Required |
Start with a low volume, especially with headphones.
Frequently asked questions
Do I need to read Spanish?
Not to enjoy the illusions or the piano: the experiments are about listening. The solfège games explain themselves with notes and a piano on the screen, though their instructions are in Spanish.
Is it free?
Yes, all four toys are free and need no account.
Does it work on a phone?
Yes. Some experiments only work properly with headphones.
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