There are two Coolaudio V411 analog switches per channel to adjust the gain, and quite a few shift registers to provide the control inputs to the analog switches. The layout seems to be a conventional frontend using discrete transistors as first stage amplification and a NJM4580 as a differential amplifier. The board with the mic preamps is rather interesting. There are also a bunch of NJM4580 (1+1/2 for each channel), likely for a final level adjust and to drive the differential inputs of the ADCs. There are two of them, for 16 inputs in total. The most interesting chip on the ADC board (bottom-most in the three-board stack) is the Cirrus Logic CS5368 octal 24bit ADC. There's a truckload of New Japan Radio Corporation NJM4580 Dual Opamps used inside the XR18, andĪ bunch of them seem to take care of driving the differential XLR analog outputs.
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