helps to RTFM... which is on the original module and not included on 3rd party panels
https://www.modulargrid.net/e/make-noise-mmg
"The AC coupled Input has an attenuator to adjust signal levels. An un-attenuated DC input is also offered as this was the type of input utilized on the original QMMG. Together these inputs allow for mixing audio signals or combining a control signal with an audio signal to yield asymmetrical behaviors in the circuits that follow."
Which definitively answers the question - yes you can send AC signals through the DC input
Clicking on the link on the product page leads to an error... so module discontinued... good luck finding one!
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities