The rumour about Ola Ohlssons death is just a rumour. I don't know where he is, if he is still alive. Ola Ohlsson is a very common name, there are probably hundreds in Sweden. He could live anywhere in the country. So unless someone wants to call all the Ola Olssons until they find the right one... I'm not sure, but I would doubt that any of the other ex members have contact with him. He was basically fired from the band because they thought his vocals sucked.
As for the other ex-members, most are accounted for. Mårten Edlund still ives in Umeå, I did an interview with him some years ago. Anders Zackrisson also still lives in Umeå. He and Edlund have contact, I think they even had some cover band toghether. Björn-Erik Melander lives off composing and releasing relaxation music and thinks metal is shit. Jonas Östman is still drumming here and there. Last year he did an album with a band called Dark Illusion, together with among others ex-Candlemass singer Tomas Vikström.
As for other recordings: I think I did a pretty good job seeking out two unheard demo tapes and a live recording, so cut me some slack will ya.
As for the radio interview: This was actuallyu NOT aired inbetween the 8 track concert recording, that's a misunderstanding. The live concert was aired without interruptions. The interview was a separate broadcast, during which they also played some Gotham City songs.