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Well it all starts with this plain AD/DA routing:
The FW1 inputs 1/2 are linked to the Main Input block, because they cannot be directly linked to the analog output block. From there they are linked straight to the Main Out block slots 1/2, and the default link to the analog outputs 1/2 provides your DA monitoring output.
The Analog inputs 3/4 are linked to the Main Input block, because they cannot be directly linked to the FW1 output block. Main In 3/4 are then linked to Main Out 3/4, and finally to FW1 out 3/4 for your AD work. Note that the default connection to Analog out 3/4 will echo this signal! Simply do not listen to Analog out 3/4. 😉
So the AD/DA functionality takes half the slots in the Main Input block. The rest of the slots are still free though, as well as both DSPs. You'd use FW1 inputs 5/6/7/8 to reach the DSPs, and route the processed signal back to FW1 outputs 5/6/7/8. One of the options is to have FW1 5/6 use DSP-A and FW1 7/8 use DSP-B. Such a routing is shown in the following picture:
Hope this helps.