Here's a whole category of device I never knew existed - a multi-track communications audio recorder that records onto VHS cassettes.

I found this one while browsing eBay; unfortunately it turned up without its keys and without its documentation, but I managed to get it working and have a little play with it.

00:00 - Preamble
05:50 - First Power Up and Look at the Heads
08:40 - Playing a Video Recording
13:20 - Figuring out the Input Connector Pinout
17:47 - First Audio Input Test
21:00 - Test Music Recording
24:41 - Test Speech Recording
27:06 - Conclusion and Wrap-Up