User Guide

Multiple Master Fonts
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Click the OK button and wait while FontLab generates a font. Some glyphs
cannot be blended (usually these glyphs have different number of
contours). If they are present, FontLab will show a warning dialog box and
these glyphs will have the first font on the outline layer and second font on
the Mask layer, so you can correct outlines and use the Mask to Master
feature (described below) to build the MM font.
To not let FontLab add nodes to compatible contours leave the Do not
interpolate compatible outlines option switched on.
Those glyphs that had compatible outlines and do not get additional nodes
during the blend operation will be marked with green color in the font
window.