The half filter reduced rhythmic values by one half. The primary use is for applying rhythmic reductions to modern editions of mensural music. This filter reverses changes made by the double tool.
Here is some example music in 2/1 representing original mensuration rhythms:
The half filter will convert the time signature to 2/2 and reduce all rhythms by 1/2, such as whole notes to half notes:
The filter can be applied multiple times, for example to shorten the notes to 1/4 of their original durations: