Can CV-Gate Send an A-440?

I know that sound like a strange question, but has anyone used CV-gate to send an A4?

The reason I ask is because on my system it can’t.

I was working with a percussive instrument that only had nine notes defined, so CV-Gate seemed an easier approach than CV-MIDI. I wired up the module and routed it to the external MIDI instrument:

and it works, provided I don’t send it A4. All the other notes work. But when I send it A4, it always either produces harsh and surprising output (occasionally), but usually it just crashes:

[175.533 fatal src/main.cpp:45] Fatal signal 11. Stack trace:
9: ./Rack() [0x56d2b1]
8: /usr/lib/ [0x7f7da26306a0]
7: /usr/lib/ [0x7f7da2758b2d]
6: /usr/lib/ [0x7f7da30e625b]
5: ./Rack() [0x820b3b]
4: /usr/lib/ [0x7f7da30e422a]
3: /usr/lib/ [0x7f7da30e3ef8]
2: /usr/lib/ [0x7f7da31008ed]
1: /usr/lib/ [0x7f7da33d73e9]
0: /usr/lib/ [0x7f7da26f3293]

As you can probably tell from the stack-dump, I’m routing MIDI via Jack:

I had never worked with the synth before (linuxsampler), so I thought the issue may be with it, but I tried different sample sets and then an entirely different synthesizer (zynaddsubfx), and the behavior is consistent: rack crashes when I ask it to play an A4. Works fine when I use an external MIDI keyboard in lieu of the CV-Gate module.

Has anyone seen this before? Has anyone heard the clarion bell of 440 Hz wafting from their speakers when using CV-Gate?

It’s really, really weird.

BTW, I’m trying to replicate this on my old Macbook, but I can’t seen to get VCV to speak JACK. I bring up JACK with qjackctl and it comes up fine, but the Audio-8 module only shows Core Audio and Bridge as options, and the patchbay in jack doesn’t see VCV.

Does VCV on Mac not support JACK? All the reading I’ve done on the web at least implies that it does.