I have a dynamic mic and a tube preamp/compressor.

The preamp output is mono.

Will the MODX mono input still function as a line level signal?

Many thanks for any info.

The A/D Input can be set for a Stereo or Mono input, and it accommodates Mic or Line Level inputs.

Press [UTILITY] > touch “Settings” > “Audio I/O” > Set “Mic/Line” = Line
Setting this to “Line” prepares the input for Line Level signal

The A/D Input can be setup and used globally or you ca opt to use it as a programmable setting on a per Performances.
On the screen, touch the “FX” option on the very top line of the screen. Here you can set “Global A/D” if you want the same setup to apply throughout (On), or set Off and program the settings on a per Performance basis.

To configure on a per Performance basis (Global A/ D = Off) From the [PERFORMANCE (HOME)] screen:
Press [EDIT] > touch “Audio In” > here you can see its parameters using the options in the second screen column > “Mixing”, “Routing” etc., etc. The A/D In can be routed through its own pair of Insertion Effects, and has its own EQ. This setting can be stored within the current Performance when the “Global A/D” = Off.
“Mixing” — the upper section deals with the A/D In. Set the “Input Mode” to match the input jack you plugged into...
“Routing” lets you access the Insertion Effect routing.
“Ins A”, “Ins B” — access to the parameters of the selected Effect blocks
“EQ” — configurable 2-band EQ and access to -/+12dB of Gain.

Extra Credit:
Treat your Input as a Line Input... as your Mic is presumably plugged into the compressor/preamp, then it’s output is fed to the MODX. You will make the LINE setting on the MODX because it is receiving an already ‘pre-amped’ (boosted) signal. Set the front panel A/D Input Level Knob to minimum. Use your external preamp’s controls to set the gain amount.

FYI — the A/D In on the MODX has a very sophisticated pre-amp with access to its own dedicated Insertion blocks that include high quality utility processors and Effects. These can be used in addition to or instead of your external device.

Most excellent!

I just purchased a mono tube preamp/compressor and I wasn't sure if it would work with MODX in mono as line..
Your info was most helpful.
I will reference your reply/info when I hook up the preamp to MODX.

Thank you very much Bad Mister.