Koala Sampler is a music production app for iOS that allows users to chop samples and create music. One of the features of Koala Sampler is the “choke” function. The choke function allows sounds that are grouped together to cut off each other when triggered. This is useful for creating music with instruments like high hats, where you don’t want multiple sounds to play at the same time. The choke function is also sometimes referred to as “choke groups”.