Hey gekkekoe about your questions:   - is there a way to dim/disable the white led ? Its kinda anoying when it blinks when there's no data. There is a way to dim it from the software control panel. No option to disable it. - Did anyone tried to see if you can update the firmware ? I get...

The output impedance for the Zodiac and the Zodiac + is 120Ohms. On the Gold, there is the option of selecting between 120 and 0 Ohms, plus an Head Phones amp attenuator (0 and -12dB)   Cheers!