Another AUAC Update - Volume Matters!
If you've been reading the last few posts hereabouts, you'll know that I've recently updated most of my audio-processing scripts. The AbsolutelyBaching Universal Audio Converter (AUAC) in particular received a significant new piece of functionality: when extracting high-res audio from an SACD ISO, it will now boost the resulting FLAC files' audio volume by 6dB (6 decibels).
This was done because I had noticed that SACD extractions usually had much quieter audio than the same music mastered onto ordinary CD -and, asking around, I discovered that for assorted, obscure technical reasons, the music industry records SACDs at -6dB, to prevent distortion. So the quietness is built in. The recent AUAC update therefore built it back out again, by increasing the volume by the same amount the industry reduces it to prevent audio artefacts getting encoded into the signal. This is a safe thing to do, since we're no longer mastering and recording the audio, and thus at risk of creating artefacts. We're just, essentially, turning up the volume knob after all the processing and mastering has long since been completed. [...]