the Clave is a clave pattern metronome/click track app with four selectable clave patterns: Son, Rumba, Afro (6/8-style) and Bossa Nova.

– The current pattern is shown on-screen in traditional notation, with each beat highlighted as it is played.
– Tempo is variable from 40 to 180 beats per minute (cut time), and the timing is rock-solid: accurate to the nearest sample (22 microseconds). All patterns start in 3-2 (“forward clave”).
– Playback continues when the screen lock appears, and also when the silent switch is active (on iPhone). The application responds to the volume up/down keys.

It’s a useful practice aid, whether you are beginning to play Latin American music, or an experienced sonero.

http://appshopper.com/music/the-clave