What instruments can double tongue?
Double tonguing is easiest on brass instruments, and it is more difficult for some woodwind instruments, primarily the clarinet and saxophone. There are different ways of tonguing for the flute.
How do you double tongue on a brass instrument?
In most cases, this means using the tip of the tongue to stop airflow. When double tonguing, we use not only the tip, but the middle of the tongue to stop a note. For instance, if you think of normal playing as using the syllable “ta”, your double-tongued notes should alternate using the syllable “ka”.