[Feature request] Add audio filters

[Cqoicebordel]

I have some bad files for some audiobooks, and it's a pain to listen to them. There is some white noise, and other kinds of noise.

What I'm proposing here is to add some filters, like low/high/band pass filters (configurable, of course) to enhance the comfort of listening.

Of course, more filters would be welcome, like a full denoiser, or others.