Code of silence

摘要

Some early CDs sounded rough because they had been mastered from heavily equalised LP masters. Pressure from the hi-fi press forced the music industry into using a logo system: ADD standing for Analogue recording, Digital mixing and Digital transfer to digital disc; DDD for all digital, and so on. This was better than nothing, of course, but only just. The third D is redundant because all CDs are digital, and there was no guidance on source provenance.