For me personally, I would run three separate lines if it was easy to do so. One main with a gate valve. One secondary with a Durso standpipe and one for emergency only (straight pipe, ending just above Durso). I would tune the gate valve so some water goes into the secondary but not the emergency. Adjust it basically so just a little water goes into the standpipe so it's still silent. The advantage here is that your need for continuous adjustment is greatly reduced, if water flow increases or decreases slightly for any reason it will still remain quiet.
It really just depends on what you want, many people with a Herbie swear they never need to readjust the gate valve but I know of people who didn't like the system as they found it required too much adjustment, I fixed their concerns by changing to something similar as I mentioned above.
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