How to splice audio in audacity

The reason it’s best to record as high as possible (without clipping) is because of the concept of a noise floor. But the importance is often over-stated.

First, I need to explain about dynamic range.

The range of human hearing is ~120 dB for people with excellent hearing. Anything lower than that can’t be distinguished by a human. In a digital signal, every bit you use to record something you get an extra 6 dB of dynamic range.

A 16-bit signal has 96 dB of range, a 24 bit signal has 144. I think the 32-bit float allows for 192 dB of range, but I can’t remember if the different format throws that off.

But all of that is just the digital domain, what happens when we enter the analog world (amplifiers, speakers, and recording)?

Audacity mix voice and music

Well, there are no perfect amplifiers or recorders. They all have a noise floor that they’re going to put out, and any signal that is smaller than that noise floor will be lost completely. Generally, this noise floor is about -90dB or so for good quality equipment, for studio equipment this is often about -105 dB.

So

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