Nice, what I was trying, and probably failing, to say was...
by trying to do these things you come across stumbling blocks, this does two things:
1) it lets you know what is missing in your system and what to go for next
2) as you have shown very nicely, it makes you think about how you could achieve something similar without the correct tools
2, imho, is a significant portion of what modular is all about for me, it's about thinking laterally and trying things you would not normally do with a classic synth architecture.
I have just built 2 Entropy to sell!! I know you probably want to do this yourself, but if you are interested and in the UK or EU, it would help me out to have a sale - of course absolutely no trouble if not :)
Good choice by the way, I really rate the Zlob stuff!!