IWBNI fractional time signatures were supported.

An example of a fractional time signature is shown below. In this example, the time signature indicates that the measure consists of 2 beats. The duration of the first beat is a quarter note. The duration of the second beat is 2/3 of a quarter note. A fractional beat such as this might contain an incomplete tuplet that is 2 of 3 eighth notes played in the time of 2 eighth notes.

The characters used for this graphic example are listed in the following table:
 

Character	Font	Character Number	Font Size	Font Style
1	Maestro	49	24	regular
4	Maestro	52	24	regular
+	Maestro	246	24	regular
2	Maestro	50	12	regular
3	Maestro	51	12	regular
/	Maestro	203	16	regular

The Interface to Create Fractional Time Signatures:

The beat group edit boxes in the Composite Time Signature dialog box could be modified to allow one to enter division and space characters. With this, one could:

• Enter: 3+1/3

To Get: 3+1/3 (with 1/3 as a fraction)
 
• Enter: 3#1/3 (where # represents the space character)

To Get: 3 1/3 (with no space after the 3 and 1/3 as a fraction)

• Enter: 31/3

To Get: 31/3 (with 31/3 as a fraction)

The Appearance of Fractional Time Signatures:

• Numerator and Denominator Font Characters. The characters used for numbers in the numerator and denominator of a fraction could be the same as those used for normal time signature numbers. The font size used for the numerator and denominator of a fraction could be half that of the normal time signature font (i.e. half the size of the font that is specified in Select Default Fonts>Notation>Time).
• Numerator and Denominator Vertical Position. The numerator could be vertically centered in the top staff space. The denominator could be vertically centered in the second staff space from the top.
• Numerator and Denominator Horizontal Position. A new numerical edit box called Denominator Offset could be added to the Time Signature Options dialog box. The left edge of the denominator would be immediately to the right of the right edge of the numerator when this offset is 0. A positive offset "x" would shift the denominator to the right by "x" EVPUs.
• Division Sign Font Character and Vertical Position. The character used for the division sign could be specified on the Select Default Fonts dialog box by using a new Notation symbol called Time Signature Division Sign. This division sign could be a slanted line to form a 60 degree angle with the staff line. The baseline of this character could be its vertical midpoint and the character could be centered about the 2nd staff line from the top. The weight of the division sign could be roughly the same as that of the time signature plus sign. There could be a gap above and below the division sign, between the division sign and the top and middle staff lines. The division sign could span about 62% of the space between the top staff line and the middle staff line. The top and bottom of the division sign could be squared off horizontally.
• Division Sign Horizontal Position. The division sign character could be positioned so that it is horizontally centered. Specifically, if xl is the horizontal coordinate of the horizontal center of the division sign, and xn is the horizontal coordinate of the right edge of the numerator, then xl could equal xn+(Denominator Offset/2).