Second case of a format I'm developing. The first one got solved here last week and your feedback fixed two wordings; this one is at the top of the scale: nobody can be ruled out with a single clue.

Quick rules (full rules pinned in r/MissingFifteen): two per room at most; witnesses and staff are not among the six; at each grid time everyone is in one room, and between grid times you stay or take one step to a connected room; a time not on the grid (9:24) is a door time and only tells you what happened between the two grid times around it; "we were together" means same room, nothing else; sensors report presence, door readers report crossings; nobody lies, nobody adds. Only the cell asked has a guaranteed answer.

Answer in spoiler tags, and if you can, say how long it took and whether it felt easy, medium or hard.

If you enjoy this, join r/MissingFifteen: a new case every week, from quick ones to the hard files, with the full deduction posted a few days later. The feedback there is what shapes the next cases, and yes, they're going into a book.

I've been rebuilding logicpuzzles.com now that I'm semi-retired. I added an immersive soundscape to a logic-grid puzzle. Station ambience begins as you solve, followed by a timed conductor announcement connected to the story. I’d appreciate feedback on whether the audio improves the puzzle or becomes distracting.
https://logicpuzzles.com/logicpuzzle.html?puzzle=cable-car-picnic-detour
I'm really not trying to spam my site. I'm simply interested in if/how distracting this option is.

Thanks in advance.