What’s the best way to compress mp3 files but still retain the quality (even possible)?
If you’re not starting from a lossless format (like FLAC), you shouldn’t really be compressing anything. When compressing from a lossless format to MP3, it’s totally subjective. When I was more into ripping CDs, I’d do V0 or 320 - there’s probably plenty of internet arguments by people more knowledgeable than me if you need a breakdown in different MP3 compressions.