Alex Gaudino - Destination Calabria -flac- Up B... Direct

Good FLAC → dynamic range preserved, no lossy artifacts.
Bad FLAC → upscaled MP3 — check with spek or Audacity spectrogram.

A sine wave + sawtooth hybrid, sidechained heavily to the kick. The release time of the sidechain is critical; in FLAC, you hear the bass "pump" back in perfectly in time. Alex Gaudino - Destination Calabria -FLAC- UP B...

Your search includes "...UP B..." which strongly suggests you may have been looking at a torrent or scene release naming convention (e.g., Alex_Gaudino-Destination_Calabria-FLAC-UPB). The "UPB" might refer to a release group from the mid-2000s (possibly "Upbeat" or a personal tag). Good FLAC → dynamic range preserved, no lossy artifacts