After pressing one of the 64 Snapshot buttons to playback pose, the Max Time Slider will advance forward in time N frames. To determine how many frames, adjust the spinner below the AutoAdvance Button. When saving a Snapshot Pose, this advance value is also saved with the pose, allowing different poses to AutoAdvance the time slider at different values. The AutoAdvance value being used will be displayed in the little text window to the right of the AutoAdvance button.
This button will override the pose saved AutoAdvance value and use what is currently in the spinner.