cs8412 tweaks with hex inverter

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hi, im playing around with old cs8412 cuz i kinda like the sound over dir9001. i found fred's circuit here and am about to p2p it. question is, what do i do with unused pins on the inverter chips? tie the input to the ground?

here's the circuit and the old thread.

8207d1047383268-spdif-comparator-elso-interface-sm-gif


Problem with SPDIF comparator (Elso)
 
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