Hi Damien,

  I improved the coordset command so you can say

    coordset #0-3 1,100

in tonight's Chimera daily builds.  (Will not be in the Chimera 1.6 release candidate though.)  Using multiple commands separated by semicolons or the above single command will play all trajectories in sync.

    Tom

On Jan 26, 2012, at 10:03 AM, Elaine Meng wrote:

You could try putting four coordset commands together with semicolons, e.g. something like:

coordset #0 1,100; coordset #1 1,100; coordset #2 1,100; coordset #3 1,100

That should all be one line... the e-mail program may break it up.  You would substitute the model numbers of your morph trajectories and frame numbers as appropriate, and you could include other "coordset" options. 
<http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/coordset.html>

I'm not completely sure they would start simultaneously, but that's my best guess of what to try.

As far as I know, they should start at the same time.  If they don't, let us know!

--Eric