No one has yet come forward to take credit for the cassette tape which showed up in the ULA's mailbox the day of the Medusa event, and which I played at the show. (It was mildly amusing.) The person who made it has to be a reader of the ULA site.
The return address was given as 122nd and Riverside Drive-- the envelope was postmarked Astoria NY. The tape was a fairly professional effort-- nothing I could've come up with, especially given my current circumstances.