I also noticed this problem, but not only for these two channels, but in principle for all ADC 1 channels. Perhaps this is a problem with the wiring of the wroom module. In any case, the useful signal is duplicated to other channels only when they are not connected to external signal sources. When e...

I connected two microphones according to the following scheme. Both microphones work in mono format. When I try to get a signal in stereo format (RIGHT_LFET), the useful signal is only on the left channel ( x = 0, 2, 4 .... 418), and random values are received from the right channel (x = 1,3...419)....