Why do you need a buzzer for each LED? Isn't one buzzer enough?
I am sorry that I lacked enough information about my project. Actually the point of the question (and mostly because I am curious about the electronic components usage) was to get to know if that would be possible to use the buzzer, (or piezo) in a way it would produce just a beep even if on a constant HIGH output.
I am using an arduino MEGA, and unfortunately it already have all outputs compromised with one led each. In this project each led will be displaced on a 3D space, so the sound and light would have the exactly same source - for the user experience.
I have already used the tone() in a previous experience and of course if I had extra outputs life would be easier for this project
That's why I set that question regarding the use of maybe a capacitor and a transistor. The idea of using the transistor would be that it would cut the sound of the buzzer/piezo instead of decreasing its volume - but I guess that the right capacitor would work this idea out by itself.
I don't have the capacitors here to make a test but I was just wondering if, in previous scenario, the capacitor charge would produce another beep (any sound) when I set LOW to the circuit, after setting it HIGH.