fixedLineSpacing

Set the text line spacing.
[read/write property] fixedLineSpacing([out, retval] double *lineSpacing) fixedLineSpacing([in] double lineSpacing)
This function sets the line spacing, or vertical character pitch, in points. This value is used only in line printer mode; it will be ignored in other modes.

If the line spacing is set to zero (the default value), line printer mode will automatically compute the vertical spacing.

VB6:
pdf.fixedLineSpacing = 10.0
fixedPitch
linePrinterMode