For hardware modular fans: A few affordable MIDI to CV products
I just found a few affordable MIDI to CV converters that I find worth mentioning.
I haven't tried any of them.
$40 12ch MIDI to CV, DIY assembly, PCB without CV sockets
$64 12ch MIDI to CV, assembled PCB with CV sockets
$139 MIDI to 4 CV outs + 12 Gate outs plus a few MIDI clock and transport to output tricks