For those of you that use the pre-amp, have you guys experimented with the hybrid volume control yet? I find it a significant improvement over the pure analog volume control. I get better clarity, imaging, and depth. To boot, there's less harshness to the sound, everything sounds smoother and cleaner. Give it a shot if you can.
Also, for those of you that use headphone amps, try maxing out the pot on your headphone amp, and using the volume control on the DAC instead. I prefer that over using the pot.
On another note, I'm still getting the output locking issue occasionally, still gotta cycle through the outputs for it to lock. And for some reason, the I2S modes don't work anymore? Swapping through the 3 modes doesn't change anything anymore.