More information about VK3ASE's exploits. The crossband recordings page even includes a bit of me from back in 1978.
Crossbands were a terrific way to have a multi-person conversation on amateur radio. One station would mix together several receivers and transmit the mix. Participants could have a pleasant full duplex conversation. Sometimes these got rather silly but often were most entertaining and a snapshot of the time.
Live streams are available here.