An automatic player piano records an original key motion reciprocated between a rest position and an end position as a series of a key-on event, a hammer event and a key-off event by using key/hammer sensors, and supplements the key/hammer event for an unusual key motion such as a half stroke,...http://www.google.com.au/patents/US5739450?utm_source=gb-gplus-sharePatent US5739450 - Keyboard musical instrument equipped with dummy key/hammer event supplementing system
Keyboard musical instrument equipped with dummy key/hammer event ...
