At the very least you need a DSD capable DAC, period. Simply serving up DSD files, whether via DoP or ASIO, is not enough. The DAC chip MUST be capable of 1 bit 2.8mHZ decoding. You can't fake it. And to retrofit a DAC that has an underutiltized DSD capability (many DAC chips can theoretically do it and don't)...ain't easy. it's not firmware, it's a hardware revision. If James/Bryston is truly creating a new DAC , capable of 24/192 via USB, then the chip must be DSD-capable. Just 24/192 is not enough. There is no "software" solution.