Thanks for your usual thoughtful and thorough response. Unfortunately, it seems the discussion took a turn away from my intended subject and turned into a very interesting conceptual discussion on how/when/where/if TTL-BL should or shouldn’t be used.
My intent was decidedly more mundane and mechanical:
I just want to know which buttons to push and/or what settings to use. So let’s forget the indoor Halloween party and assume an outdoor situation appropriate for TTL-BL. What buttons to push and/or what settings to use to get TTL-BL to even show up on the SB-900 information screen?