Oh, was gonna post a comment about this, I actually bought just last week their USBc version (Fotric Sonic 3), on eBay, for around $700. Works quite well, it has 64 mic array, I think it would be tough to replicate it to this level.
Lmk if anyone has any questions about it! It’s android-only, but I’ve gotten an agent to write a Mac version of it though haven’t tested yet.
eBay link to what I bought: https://www.ebay.com/itm/960060893216
Are you able to gather the multichannel recordings off the device? I’ve often wondered if you could do that, then replay a video while focusing on specific parts of the scene. Kind of like a virtual stethoscope.
For an intermittent beep, could you point it at a room and then leave it recording video for an hour, then come back later and scrub through that video looking for the source of the noise?