Tiny Pilot KVM + voyager VGA adapter, no video, just snow

I have a tinypilot kvm with voyager and I'm having no luck with connecting to anything with a VGA output/input. I get 'snow' and flashing of different screen sizes. This is confirmed to be the case on the three machines I've tried it on so far. The HDMI input works fine, it's just the VGA adapter that has failed to work.