yes clouds should have enough gain to deal with line level - not tried it to be honest but if that's what the spec says then that's what the module does (it's mutable instruments!!!)
the big question though is not what audio are you going to feed into it, but what are you going to modulate it with???
clouds loves modulation - and attenuated modulation at that!!!
"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