I am composing using a mixer I build in Max. Would be nice, since it's live composing, to make a visual recording of what I am doing so I can later reproduce and make changes if I need it.
Anyone knows a good way to do this?
If you really want video, you can use one of those screen capture programs, like Snapz Pro X (mac) or Camtasia (win).
But maybe you could instead just write the parameters of your patch to a file with a small time interval (maybe 20-100 ms or so), like you would record automation in a DAW. That way you can actually have the patch 'reproduce' the composition, if you manage to add all the relevant parameters.
Check out [text] or [coll] for writing data to a file. You can think about adding a timestamp to every line of data you add, so there is some info about the speed of playback in the data itself.
QuickTime X, File > New Screen Recording.
To capture audio, you have to physically loop the output back into a line in, or even pick up the speakers via a mic, but it's free and very straightforward to use,