Sascha Franck
Rock Star
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Just on the modular thing - SPDIF is not usually a zero latency interface. Sometimes the latency experienced with SPDIF input is longer than the analog input latency. The digital data stream is collected in buffers on the way in and doesn't necessarily pass on to further processing with minimal delay.
Add to this that each CPU will stlll deliver it's own latency. Given that nowadays complete AD/DA conversions can be done in <1ms, also given that the FAS units come with around 3ms RTL (from all I remember). So instead of 6ms in total when running two devices serially, you will now be at around 5ms. Very obviously, fidelity is preserved better that way, but you don't win much in terms of latency.