The envelope (containing top and bottom outlines) of the lettering (single or multi-line) can be individually customized. The Envelope Type box and Envelope Slider control the envelope. There is an Envelope Slider control for the envelope top and there is an envelope slider control for the envelope bottom. There are four styles of envelope: Curve, Grow, Peak and Shrink.
If you use these controls and want to return the lettering to its default settings simply click the zero control.
Enveloping Curved Top and Bottom Envelope
Enveloping can produce a variety of creative designs, especially when you begin breaking up the words into segments and enveloping each one separately.
Sample above uses two envelopes and a lower case “o” resized for bubbles.