I found another batch of tapes including a mix tape I made in the WRHU two-track studio in May 1990. Yes, two-track: we recorded two audio tracks onto 1/4-inch tape at 7.5 inches per second (or 15 ips if we needed to do some music editing). We then cut the tapes with razor blades and spliced them together with splicing tape.
Eventually I graduated to the misnamed 4-track studio, which by then not only had a 4-track quarter inch deck but also a 1-inch, 16-track system that only the General Manager was allowed to play with.
Now that you know the technical limitations, listen to this teaser promo from May 1990. As a bonus, here is the Uh-Uh Oral Contraceptives spot that my predecessors created in 1984 or 1985.