Hi AC, yes on the right path… the firmware changes can change the code execution timing which in turn controls the timing of digital currents read and writing to memory or CPU execution… this in turn changes or ‘shapes’ the conducted noise in ground planes, electro magnetic coupling and internal powerlines.
This reshaped noise can interact with digital clocks and analogue circuitry to produce an audible affect.
I understand a few years back Naim had pretty well managed to control this to almost act as a ‘tone control’ or eq. I understand however, despite this, it is still somewhat inexact, and results not always deterministic.
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