I am happy report that I was finally able to test the Underground Accelerator in a live fire situation with guitar and drums, with 2 other musicians with discriminating ears and it passed with 6 thumbs up! We all agreed that the UA made a definite positive impact on tone with both of my test basses in a variety of styles and settings. We tested the UA set for unity gain and me switching it in and out during parts of songs. Test basses were my Carvin LB50 Koa and Peavey Unity LTD with Seymour Duncan PJ pickups speaker was an Alto TSL215 with no EQ (essentially a 500 watt studio monitor).
Just need to send each pedal with some white gloves.