JACK [metadata](https://github.com/jackaudio/jack2/blob/master/common/jack/metadata.h) would allow for setting port properties like '[CV](https://linuxmusicians.com/viewtopic.php?f=1&t=20701)' (for use in JACK/LV2 modular synthesis setups).
JACK metadata would allow for setting port properties like 'CV' (for use in JACK/LV2 modular synthesis setups).