Caples Productions Delivering Knock-out Events With Grass Valley Indigo AV Mixer Case Study (LPS-4019M) File size: 769.5 KB, posted Feb 03 2011 Caples Productions produces a variety of live mixed martial arts events with a Grass Valley Indigo AV Mixer, using it to mix camera angles and audio levels coming from numerous sources. The AV Mixer is part of a fly-pack solution to accommodate space-constrained locations.