It doesn't look like much without its black shroud, but this is my Xonar HDAV1.3. Despite this card is marketed for HDMI usage, its analog out is rather good. Like any other my soundcard I modded this one too, following the datasheet, I found most mainstream cards don't follow this, I have no idea why. Entry level professional cards usually follow them and it sounded better than mainstream ones.
I replaced a few caps (4 red ones) surrounding buffer opamp and swap I/V opamp. Two LT1498 on I/V stage replacing JRC4558 and very famous LM4562 on buffer. Tbh I don't like how National LM/LME sound, like it's too....digital sounding (if that made sense) Linear LT opamp sounds much more organic, even if it's not as detailed. But putting these two together sounds rather nice, they got nice synergy with my system. I prefer the sound of this card over Titanium HD, despite it uses lower spec PCM1796 DAC, but it didn't have EAX higher than 2.0, main reason I didn't use it much (I still play EAX4 games like Doom3 and Quake4). Also bypass the caps at the end there as there is no need for it, as I measured zero DC offset, there isn't any in datasheet either. I might put this on one of my retro build. There is official XP driver for it too.
Speaking about soundcard, X-Fi Titanium HD is now in retro web. I feel old now....
Get info, images and drivers for the Creative SoundBlaster X-FI Titanium HD (SB1270) expansion card
theretroweb.com