tremolo 

While using repeater beams was the original method for indicating tremolos, often playback and display are not well-enough integrated in an application to make that feasible. The tremolo ornament can be used to indicate either single-note or double-note tremolos.

Element Information

Model

Attributes

QName Type Fixed Default Use Inheritable Annotation
color color optional
default-x tenths optional
default-y tenths optional
font-family comma-separated-text optional
font-size font-size optional
font-style font-style optional
font-weight font-weight optional
placement above-below optional
relative-x tenths optional
relative-y tenths optional
type start-stop-single single optional

Source 

<xs:element name="tremolo" type="tremolo">
  <xs:annotation>
    <xs:documentation>While using repeater beams was the original method for indicating tremolos, often playback and display are not well-enough integrated in an application to make that feasible. The tremolo ornament can be used to indicate either single-note or double-note tremolos.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample