An intonation training device for training musicians in just intonation. As disclosed, the device is a pocket-sized portable device with an audio output and a user interface which includes an LCD display and a device such as a push button for selecting an item from a menu. When the device is turned on,...http://www.google.fr/patents/US7365263?utm_source=gb-gplus-shareBrevet US7365263 - Intonation training device
