the wmd modules may be difficult to source, they closed, but have re-started as ammt (I think that's correct), but I haven't seen any modules from the new company yet, I know the plan is to re-issue newer versions of some of the wmd modules
you should be able to pick them up used, but they may be expensive! or there may be a few left in stores!
you might want another filter, a waveshaper, a simple mixer, a clock divider, an end of chain mixer (with send/return) etc to get the most out of these modules...
how are you intending to mix the output of the modular and the analog rytm...
can the analog rytm be externally clocked?
"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