CUETools_2.1.6 - I don't understand something

3 options with compression: fast,high and insane.
Which setting should be chosen that the sound of music stay natural,good etc?

What CUETools does with Ape format when I choose fast or insane?

I think more compression = better quality audio files. It will also take longer to rip them and they will be bigger in size.

I would probably just choose “high”, right in the middle, and I think that would give you a nice good sound.