Louis Armstrong The Complete Decca Studio Recordings Flac Patched [updated] -

Rather than risking malware with unofficial "patched" downloads, serious collectors look to the physical and digital masters restored by high-fidelity historians. Box Set Collection Covered Years Label / Publisher Key Features 1935–1946 Mosaic Records

To understand why "FLAC patched" versions exist, you must understand the source material. There have been three major official releases of this material.

Early recording lathes were often hand-cranked or had inconsistent motors.