here is a lateralus album by tool i ripped recently with FLAC customization using window parameters that were in place for a custom variation i chose myself to give a desired result. its a fresh rip and you can alter window values with different slider values over each conversion as you wish. its a good place to start realizing the intricacy of how flac conversion works for better quality.

Tool - Lateralus - FLAC .tar.bz google drive public link