That`s why I like using ASIO4ALL - I only adjust it once to desired buffer and that`s it. Now only thing You`ll have to do with other programs is to setup their output to ASIO output/plugin and every time that program starts it will automatically run ASIO4ALL at background. I haven`t tested WASAPI and its plugins so much to tell if it lets to use it same way like ASIO4ALL.
With KSP plugin I had problems playing some 24-bit hi-res files but it is much easier to setup with Winamp for example. But I still went with ASIO4ALL because it hasn`t had any problems with hi-res files and I can easily adjust buffers & latency when I do recording/mixing in Cubase. Only problem I have with ASIO4ALL is that when I have winamp playing, it won`t play additional sounds simultaneously for example with Youtube. If I close winamp, then it`s ok. Don`t know about WASAPI 24-bit/16-bit setup with different sample rate but You should set Your audio properly in windows mixer/playback settings and set to "
Allow applications to take
exclusive control of this device", then there should be no conflict between 16/24-bit. Actually I think that`s why winamp+ASIO4ALL won`t let Youtube to play sounds simultaneously because one is in exclusive mode with 24-bit but Youtube/browser is 16bit. Oeh... long story
Anyway, haven`t had lag/sync problems yet with all my other systems + ASIO4ALL. About DX50 + ASIO4ALL @ USB-DAC mode... I have to test yet because I`ve been doing mostly FW comparing. Will try to test tonight after work. Will let You know if I have any lag/sync problems using ASIO.
About IRR Bandwith OFF vs. ON ...I think it is a really good option for DX50 users - analytical listeners will probably prefer ON, while smoother and airier "tube" sound fans will probably choose OFF. Of course it is only my personal subjective view. It also depends on music, taste, cans etc. which mode to select. Most of the time I seem to prefer irr off but there are some recordings that benefit from irr on and its more analytical sound.
This card is approved by me - works flawless and is pretty fast. Cheap and good