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Using a 24-bit audio source in JACK?

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I have a Behringer UMC202HD interface, which has two XLR inputs with mic preamps and a stereo 24-bit ADC.

Using Audacity's meter, directly from ALSA, I got a decent setting for its analog preamp gains. Then I do this and look at the JACK device MIC0:

zita-a2j -j MIC0 -d hw:CARD=U192k,DEV=0 -c 2 -r 48000

...and the meter is way high and audibly clips.


If I set the preamps to where JACK doesn't clip, and compare the two meters between ALSA and JACK, they're about 48dB different, which is the dynamic range of 8 bits. So that leads me to suspect that JACK is getting the lower 16 bits of a 24-bit number.

Does zita have an option for the bit-depth? man zita-a2j makes no mention of it, except for this line, which is probably not what I want:

-L     Force 2 channels and 16-bit sample format.

Or more generally, how to get a 24-bit USB input into JACK?

I sit in a Tesla and translated this thread with Ai:

mangohost

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