I posted this in another thread, but it's relevant here too.
So the new firmware update itself introduces better optimisation for DSD loading to avoid pauses that some people experienced, as well as an optimised the 3L buffer whatever that is. Switching between the first and beta firmware, it made the music a little smoother-sounding.
The volume buttons have been replaced with changing digital filters:
- Volume up: "Time Comprehension Mode" (TCM) - a minimum phase filter with no pre-ringing on the impulse response at the cost of having more post-ringing and phase change (I find this mode to sound smoother than the one below)
- Volume down: "Frequency Response Mode" (FRM) - a normal brick-wall linear filter but it has a slow roll-off instead of a sharp one, which creates less ringing all-together at the cost of allowing higher-frequency aliasing to possibly interfere with the music
Volume control is now done via your computer while keeping everything bit-perfect.
The firmware can be downloaded from here:
http://lhlabs.com/support.html
or to save you a mouse click
http://lhlabs.com/downloads/Geek_Out_Firware_1V5.bin.zip
Installation is easy. Download the above .zip file, extract it to somewhere on your computer, open C:/Program Files/Light Harmonic/USB_Audio_Driver/LightHarmonicDFU.exe, plug in the Geek Out, browse your computer for the extracted file, press the start button, wait for it to finish installing the firmware, exit the program, unplug/replug in the Geek Out.
If you want to switch back to the original firmware, do the exact same thing as above but with this .zip folder instead:
http://lhlabs.com/downloads/Geek_Out_Firware_1V0.bin.zip
As of right now, you can't change the firmware via OS X.