I love reading old Sierra Newsletters as by the time I got hold of my first Quest games in early 1993, KQ IV, PQ III, and SQ IV for #Amiga, the company and their franchises were already well-established and they were moving toward CD-ROM games.
And so, coming across early promo hype for KQ IV and its revolutionary sound (at least for DOS PC!) and technical leap from AGI to SCI is pretty cool stuff!