[rplst8]

I don't know much about the Yamaha technology referenced, but he's not totally off his rocker.

CDs don't record 0s as pits and 1s as lands. A change from pit to land or land to pit is a one, and no change over a time base is a 0.

Therefore, the recording and tracking performance can be affected by the disc content and processing applied.

[vel0city]

Sure, I can understand how slightly changing the layout of the pits and lands can potentially reduce the error rate. But if I'm already getting playback with 0 C2 errors, there is absolutely no change in quality from the original signal.

[bayindirh]

Advanced Audio Master visibly reduces C1 errors in recorded media, to almost negligible levels. While C1 error can be corrected without any degradation theoretically, its result is up to the CD player's capabilities (and quality).

CDRInfo's tests back in the day showed dramatic improvements in C1 levels, see [0]. Considering some of the lower end CD players by leading manufacturers didn't even had 16bit audio decoding and used late stage oversampling, reducing C1 errors was/is a big deal in recorded media.

As I said in my earlier comment, this mode lead to clearly audible improvements in my older, low-end Sony CD player. I don't how how will it fare in my new Yamaha player due to technology improvements.

[0]: https://www.cdrinfo.com/d7/content/yamaha-crw-f1e-cd-rw?page...