Adding on to this that there are no soft Cs in Latin. In classic Latin, every C was like the c in a cat. In Ecclesiastical Latin (church Latin), Cs were pronounced like ch, as in church. Most of these have Latin roots or are directly copied from Latin, so if you want a more authentic sound, hard Cs.
Also, a note on the lapagna one, Magna is an adjective that means great or large, not voice. Vox, vocis means voice. Combining lapis and vox would work for the intended meaning, though.