I'm trying to learn how to use Motion Mixer, and I have a scene with one low poly object (1800 polys) that is animated over about 3800 frames. The first motion is only 35 frames long, but when I create and save it, the file is over 80MB.

I opened it in a text editor, and it looks like each channel has 3800 key entries. When I created the motion I specified that it was only 35 frames long ... is there something else I need to do to ensure that MM doesn't save out all the frame information for each channel?