When you play with a capo and strings create a kind of shrieking sound you should put something capo tightened up. Often you'll also notice that some strings to something you should vote after the capo there or have been removed.
Western and electric guitars have a round neck, while nylon string guitars neck is flat. There are also various types of capo's, with or without bulge.
This capo does not cover all six strings. It is simple variant of the Third Hand Capo, which is discussed below. For example you can put the capo in a high position on the high strings. The low strings remains open so you still have the ability to play low basses.
In the video below you see guitarist Antoine Dufour use a Third Hand capo.