In order for the chaintech to become bit-perfect, you need to flash its bios so that it is recognized by your pc as an audiotrack prodigy (and then install the audiotrack prodigy drivers). Prior to doing this, I was unable to get my digital receiver to play back 16/44.1 dts encoded wav files, which need to be sent to a digital receiver unmolested to play back. Once I flashed the av-710 and installed the audiotrack prodigy drivers the chaintech av-710 played back dts encoded 16/44.1 wav files perfectly. Thus, my verification of its bit-perfect nature is solely based upon its ability to accurately pass dts to my digital receiver which I understand will not work if the digital output is resampled.
My understanding is that the audiotrack prodigy drivers enable direct asio support that is lacking in the chaintech (and standard via envoy chipset) drivers. Note also that flashing the chaintech bios so it is recognized as an audiotrack prodigy apparently disables the chaintech's analog outputs.
the program necessary to flash the chaintech's bios is available at
http://volny.cz/needsoft/eeprw.zip (or I can provide a copy) -- be sure to run this program from a bootable floppy disk as it will not work if run from within a dos window in xp.
Note -- the chaintech only has a digital OUTPUT and does not accept digital in.