There are a few You Tube videos where we can hear The Wave after it first debuted.
The best collection is on Archive-dot-org:
KTWV (94.7 MHz) "The Wave" Los Angeles, CA : smooth jazz airchecks : Free Download, Borrow, and Streaming : Internet Archive
KTWV The Wave was one of the first radio stations to play music that was to be known as Smooth Jazz. In the early years of the station, the format was a...
archive.org
It's also in chronlogical order, so you can hear the progression and evolution of the format.
KTWV proudly declared it had no DJs.
These billboards were up all over L.A. and Orange County for the first year:

Radio & Records called the format "NAC." NAC stood either for "New Adult Contemporary" or "New Age/Contemporary".
A good perspective from the first year of The Wave:
The format description NAC was eventually dropped, replaced by Smooth Jazz.
A cast of actors did scripted mini-plays to mark the beginning of each hour.
Those vignettes were very much love 'em or hate 'em. You can hear two examples on the first aircheck on the archive-dot-org page I linked to above...the first one at 1:00 into the aircheck, the next at :59:00. They didn't all have kids, but for some reason, these did. Maybe they were dayparted for when they thought their audience would be with their kids (after school through bedtime, mornings before school, etc).
Sting and Peter Gabriel were as likely to be heard as Anita Baker and Sade.
Also Paul Simon, Rickie Lee Jones, Dire Straits, Steely Dan...