If I understand it correctly Cardinal is a modular synth based on VCV rack that could work as LV2 and Jack synth. I don’t know yet if it can be installed on ARM. If so, it would of course be a good candidate for a new engine. The setups could be done on an external computer and then used with Zynthian.
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Ahh, I missed this 
… but where is the engine implementation for this? There was enough time 