I have the Tri Vista 21 DAC as well and use Foobar as the frontend with a Chaintek sound card. Output is with kernel streaming via SPDIF. The DAC is connected to a BP25 and 4 7BST amps. Output and sound quality to the RS1B's is superb. I store all media as WAV files on a 1 Terabyte raid array. Bit perfect output will not sound any different with another modded card, as I am outputting raw data and allowing the Trivista to do the conversion. If it were to be analog output via the sound card it would be a different story. I have used this frontend on my other system as well and can say it is as good as some of the highend transports people rave about. 33H amps, Genesis 200 speakers, levinson pre. A very nice reference system to judge musical qualities. Let your ears be the judge.
MAK
MAK