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Quality

Simple

What do I need to get started?
What is transparency/cd-quality?
What are the best formats?
How do you tell what is the best format?

See Audio format guide

What is ABX?
Why is ABX needed?
Transcoding - Can I increase quality by converting X lossy compressed file to Y lossy compressed file?

Advanced

Can I use frequency analysis or other tools to judge quality?
What are good test procedures?