I am running on Windows XP now, which does not have WASAPI. WHen I get home tonight, I will set up my home Win 7 64 computer and see how that works. I downloaded CEntrance's drivers for the Dacport LX, which include an ASIO driver, and set foobar to play through the ASIO:Dacport and not the DS:Dacport. Now I can call up the control panel and see that the Sample rate that the Dacport LX is using is the same as the sample rate of the file. Using the DirectSound ouput, that isn't the case; the control panel always shows what I select, not what the music is. Does this mean that Windows is resampling as it sends to the LX?
Also, on this setting,whenever the sample rate of the input changes, there is a 3 to 5 second delay before foobar plays; as if it takes a few seconds for either foobar or the DACport LX to switch sampling rates. There is no delay when using Directsound (DS). This is still under WinXP for what it is worth.
Try install media monkey and copy the asio dll file into the "Plug ins" folder in Media Monkey program folder. Then go to ouput plugins and enable Asio and activate the DACport LX driver. This is true bit for bit playback. You will be using your amp to attenuate the signal.