AUDIO SENSOR/ SENSOR DE AUDIO

Hi everyone!
I'm a little bit desperate... let's see: I'm in art college, and now I'm on a project about "intective art", so my teacher told me that, for what I wanted to do, I needed an Arduino, and I have no clue how to use it.

I have an audio, and I need a sensor, that, when people get close to it, the audio turns the volume up, but I don't know how to do that,

can somebody help me, please?

//

¡Hola a todos!
Estoy un poco desesperada... veamos: Estoy estudiando Arte, y estoy viendo "arte interactivo"; mi maestro me dijo que, para lo que yo quería hacer, necesitaba usar un Arduino, y no tengo idea de cómo usarlo.

Tengo un audio, y necesito un sensor, que, cada vez que la gente se acerque a él, el audio suba su volumen, pero no sé cómo hacerlo,

¿Alguien puede ayudarme, por favor?

Your post seems to be in the wrong place - your problem seems to me to lie with a sensor, not with audio.

An ultrasonic rangefinder may be able to indicate the distance to a person.