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This one is the good one :
My humble newbie observations:
-Mixer. I would change Rosie and 2HP mixer for an output/mixer module, with returns and mutes. An affordable option could be:
https://www.modulargrid.net/e/tesseract-modular-tex-mix-master-section --Master
https://www.modulargrid.net/e/tesseract-modular-tex-mix-4-mono-channels --4 channels mixer
-Another filter, a multimode filter, more or less aggressive depending on the type of music you want to make.
-More and more ergonomic VCA's, you have room for them. A cheap option.
https://www.modulargrid.net/e/doepfer-a-130-2
-A sequential switch is a very useful basic to route signals.
https://www.modulargrid.net/e/doepfer-a-151
and a matrix mixer, for example
https://www.modulargrid.net/e/ai-synthesis-ai008-matrix-mixer-black