Presidents Day, 1990,Smooth Jazz 95.7 The Breeze moved to 98.3 (jockless, and at first with no announcements, a few weeks later it became "Whisper 98"), and Radio Ritmo moved from 98.3 to 95.7.
The arrangement was unique in that, every day, from (I forget but I think it was 1am-5am), the stations would return to their original frequencies...So you had Ritmo on 98.3, and the Smooth Jazz on 95.7.
By May 1990, Whisper 98 was leased out to a group that started Radio El Zol on 98.3, but, again, the frequencies would swap at 1am (or was it 2am? I can't remember)...So El Zol was on 95.7-only on overnights-by Spring of '90.
The agreement terminated at midnight on Presidents' Day 1992, and shortly thereafter, Radio El Zol shortened its' name to "El Zol 95", with a hipper presentation.