Hello,

I have been a user of RME Babyface Pro FS. I love it very much. Never had a single issue with it, and the latency is just amazing.
I also love TotalMix.
Thank you RME!

And it is primarily because of TotalMix (but also the preamps and conversion and drivers and etc.), that I plan to continue to stay with RME, and thinking about upgrading to the Fireface UFX line (either UFX II or III, still trying to figure out the justification for 64 extra IOs).

As I am wondering about all the capabilities, I recognize I frequently question the voltage levels of various audio equipment in my studio. It is time I get a good understanding, and clean this up.

How well can the RME Audio interfaces serve as an oscilloscope?
With knowledge of the preamp sensitivity, gain settings and other specs of the hardware, is there a good way to convert / graph the input voltage levels? ie map from dBFS to dBU? (And maybe using the impedance knowledge to measure current?)
(It seems DigiCheck runs all the measurements only in dBFS and not dBU).

From at the specs of UFX III, for the LoGain sensitivity of LineIn (1-8, rear):
- Input level for 0 dBFS @ Lo Gain: +19 dBu
- Variable digital gain: 0 to +12 dB

If the LoGain sensitivity is selected, and Variable digital gain set to 0, is it a straightforward conversion of adding 19 dB from the dBFS reading in software? Where a -1 dBFS reading will be +18 dBU voltage level, and -144 dBFS reading will be -125 dBU ?

Also, what does this spec mean:
- Minimum level for 0 dBFS: +1 dBu, -1.2 dBV
(I didn't understand what is a minimum level for 0dBFS).

Thank you very much!