It looks to me like the NAND gates are performing as part of the actual d/a conversion, which is why I described it as a semi-discrete sort of mash circuit. But without specific data on the dac chip driving them, I can't really be sure. It looks to me like it has not a prayer of sounding great, no matter what you did to it, short of scrapping the whole dac section & building an entirely new one. Easier to plug it into an external dac unit, though, I think.;-)
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