you may want to keep an eye out for this product, which seems to send out MIDI at a rate that keeps the H9000 happy: https://northernlightmodular.com/product/evenmidi-rack/
I’d convert the CV to line-level, send it in to the H9000 just like regular audio, and use Vsig to add inputs to the algorithms that you want to use audio-rate modulation with.
