Now that we have one Arduino per channel, we do not really need dedicated analog to digital converters. Instead, we can use the ones provided by the six analog inputs of the Arduino. They’re on 10 bits instead of 24, but since we’re going to use them for visualization purposes only, they should be good enough (1,024 levels). And we can always add the dedicated converters later on if we feel like it.
ishizeno 
“for visualization purposes only”. What do you mean by that?
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I mean the oscilloscope plots that will be generated on the user interface for every analog port. Essentially, you want to be able to see how the analog signal evolves from submodule to submodule. This requires that we have an oscilloscope port for every analog signal (48 in total). But these oscilloscope channels do not need to be precise nor support high frequency, because all we care about is to generate a user interface. Since an oscilloscope plot will usually be displayed on a rectangle that is less than 1,000 pixels tall, 10-bit resolution (1,024 steps) is plenty enough. And since we’re only dealing with audio signal that is less than 20kHz, we do not need a very high sampling rate. Hence the AD converters that are part of the Arduino should be plenty enough for what we need.
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Oh yes, thanks for the detailed explanation!
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