Indeed, I'm closer to 50 than to 40 and used to have a lot of fun with synchronised slide/tape shows. I used a Philips synchroniser and Sony TC105 quarter inch tape recorder (still got both). It was a good way of "upmarketing" the run-of-the-mill endless succession of slides with a commentary and music. Once everything was on tape, all that was needed was to turn up at a venue (usually a camera club, WI meeting, school, etc.,) set up the kit, hit play and then focus each slide as it appeared. The trick was in not forgetting when it was time to change Carousel magazines (which all had the zero tab removed for seamless changes). Antiquated technology now, but an interesting half-way stage between cine and a straightforward, potentially dull slide show. Audiences were a lot more receptive to something of a fixed length (usually 45mins to an hour) than to something where someone had the potential to be droning on into the small hours. Ah - happy days!
Steve