Is there a setting to use this as a real line out, so I can just use the (fine) DA converter, run it into my Ray Samuels, HR-2, and have the juice to drive the 560 (or into the Koss electrostatic amp)?
Thanks
Ah! I just figured something out. I re-re-re-reread Larry's comments about the 1.5 firmware update.
http://lhlabs.com/force/geekout/2081-geek-out-firmware-1v5-upgrades-and-change-log
2) New Master and Individual Channel Volume features:
To keep the bit perfect as long as possible. Although I still leave the master volume and individual channel volume control there. But the behavior is slightly different.
When you set MASTER volume to MAX. (-0dbFS), you could adjust the left and right channel to adjust the BALANCE. And keep the other channel Bit Perfect… This is GREAT for the people who use Geek Out as Line Out and want to have Balance feature
If Master volume is not set to Max, then mater volume’s setting will be applied to both channels.
I just tried this in OS X. With the master slider on maximum (0 dB), you can adjust the two analogue sliders to whatever your volume preferences are and as Larry said, it's bit-perfect. One thing to keep in mind is that in OS X, the volume controls affect the master volume. In Windows, the volume controls affect the analogue volume.
So it looks like you can use the GO with this quasi-line-out option by having bit-perfect audio being inputted into your external amplifier.