KR4 - the mods include 11 traces that are cut, 12 components that are deleted and 18 components that are added, plus some point-to-point wiring. Non-trivial, I assure you. Takes at least 8 hours to do it with the right parts, equipment and a very strong magnifying glass.
As for the I2S cable effect, I was able to reproduce the effect with a mod inside the P3, making the P1 superfluous, IMO.
As for the I2S cable effect, I was able to reproduce the effect with a mod inside the P3, making the P1 superfluous, IMO.