<p>michael- thats the idea, but with the pack at minimum power. I'm looking to see if someone has tested the pw tt1 with the pro 8a. I downloaded the latest pw firmware, but my test with the pro 7a failed. I think it's the pack, not the tt1. The idea is to use a bi-tube head to accommodate two shooters simultaneously firing at a high shutter speed, mixing strobe and ambient with no curtaining.</p>