For the output module, why not looking at a mixer+out+headphones out ?
In fine, you might end up with several voices when you'll get another vco
I started with a 4ms listen four and i replaced it by a XOH (with a XPAN before to increase the XOH limited mixer capabilities and save space)
The Quad VCA before the Out will do the job in the first time but as your rack will grow out, the needs of VCAs as well
However listen to the pro, I am still a beginner


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