Hi Hans, this is a feature request regarding fieldstack based animations. Since i want to use fieldstacks in one of my modules i’m looking for a simple to use interface to produce animations, for the moment i create a symbol for each frame and put them together with a fieldstack. For latex there is a package called animate [1] which provides a environment to produce animations with buttons for navigation (just a take a look at the examples in the manual, code is not relevant for us). I wrote now a short dummy module [1] to demonstrate how this could look in context, the first file [1] contains a few example, the environment is inspired by \startoverlay/\stopoverlay but it needs a alternative method to allow loops (look at the third example in this file). The second test file shows which navigation buttons i want for such a module, the are “first frame”, “previous frame”, “play” and “stop” animation, “next frame” and “last frame”. As a alternative one can produce a animation with a overlay button only with a symbol on the first frame to indicate a interactive element. [1] http://ctan.org/tex-archive/macros/latex/contrib/animate/animate.pdf [2] http://bitbucket.org/wolfs/animation/src/tip/files/ [3] http://bitbucket.org/wolfs/animation/src/tip/files/animation-1.tex [4] http://bitbucket.org/wolfs/animation/src/tip/files/animation-2.tex Wolfgang