Filtering an audio signal & microphone question

Yeah my goal is pretty much to do the thing by analog electronics....
but like the microphone produces AC sinusoidal voltage depending on the nature of the sound it receives right?
so being a sinusoidal voltage shouldn't it be changing constantly as the sound changes as well??
So imagine if the microphone produces a constant output of 400mV, and we amplify it to reach 2V approximately......
Using a filter to attenuate a small voltage such as 2V won't really produce a big voltage difference, so would I understand whether the signal was actually attenuated or rather just fluctuating due to the different sounds??

Thank you