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RE: Absolute level of CD during play

Boy, first one would have to have something with the "absolute precision" needed, then exposing the disc while it's in operation and measuring it at a number of points with perhaps a laser interferometer or other non-contacting method.

One could "infer" the issues you mentioned by looking at the variations in the servo feedback signal controlling the read optics and or look at the rate of the timing changes on the raw data before the buffer.

I think most cd players (at least used to) have a fifo buffer and what comes out is re-clocked internally. This means there is a tiny delay (latency) between the reading of data X and the clocking of data X out at the other end of the buffer where the D to A happens..

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