Logic Pro 9 User Manual
The link address is: http://help.apple.com/logicpro/mac/9.1.6/en/logicpro/usermanual/index.html#chapter=10%26section=10%26tasks=true
The link address is: http://help.apple.com/logicpro/mac/9.1.6/en/logicpro/usermanual/index.html#chapter=10%26section=10%26tasks=true