This is a message for ADD,
I noticed you have a pcm-d50 linear audio recorder which I also have, absolutely love, and and regularly use to record myself (violin). I just realized the other day that it (d50) has a handy little optical out. So, I used a toslink cable to connect it to the VDAC. I have to say that the sound is really incredible through the VDAC...really brings out the overtones in the violin- so far just recording 48khz 16bit using SuperBitMapping. Anyway, just thought you might want to know.