Showco introduces the concept of the portable custom P.A., commissioned by and traveling with the bands; John Tedesco‘s pneumatic lighting towers; Kirby Wyatt, Randy Blair, Steve Jander, & Led Zeppelin play with lasers; the “gel-change project”; after ten years of non-stop expansion and reinvestment back into the company, double near-disasters force a fires sale and layoffs; PAR lights and diechroic filters; “two more & it’ll move”; the Hail Mary pass to save Showco. Part three.