I just did a small experiment in Logic, with a Fireface 800 interface:

Logic's Test Oscillator, square wave at 0 dB, inserted on and audio track. All outputs set to 0dB, panned centre, -3 pan law. (Very funny joke, BTW!)

Channel Meter = -1.1
Output Meter = -1.1
Bus Meter = -7.1
Aux Meter = -4.1

Output to FF 800; FF Mixer input from Logic shows a -0.02 input.
The FF 800 out meter = -0.02
Patched this to a FF800 input, analogue.
FF 800 input meter shows -0.62
The Logic input meter from FF800 shows -1.7
The recorded signal in Logic shows -4.7 on the channel meter and -4.7 on output meter ... which then shows up as -3.62 on the FF 800 mixer.


Here are the white noise figures:

Test Oscillator, white noise at 0 dB, inserted on audio track. All outputs set to 0dB, panned centre, -3 pan law.

Channel Meter = -3.0
Output Meter = -3.0
Bus Meter = -9.0
Aux Meter = -6.0

Output to FF 800; FF Mixer input from Logic shows a -4.68 input.
The FF 800 out meter = -4.68
Patched this to a FF800 input, analogue.
FF 800 input meter shows -5.47
The Logic input meter from FF800 shows -2.2
The recorded signal in Logic shows -5.2 on the channel meter and -5.2 on output meter ... which then shows up as -8.46 on the FF 800 mixer.

Hmm...

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