The PiSound out of the box does almost everything I need in order to replace the very disappointing original OPLab by Teenage Engineering. The only thing that is missing is the CV in/out capabilities (with two CV channels too, on each). Is there a Hat available that is so far eluding my googling? Or even better, some simple circuit that will fit into the existing PiSound box? It’s not essential, I have other tools to generate CV, but it would be really nice…
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I’m not aware of a ready-made solution for adding CV input and outputs, but I’d look for an external board communicating via SPI or I²C.
Or maybe look for some MIDI to/from CV module to add into the chain? 
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