Patent ID: 7206651

Claim:
A machine readable medium containing a mixer engine control program executable by a computer for performing a method of displaying and editing a mixer configuration which specifies a mixing process of a signal processing apparatus, wherein the method comprises the steps of: logging on the mixer engine control program with one of a plurality of user authorities in accordance with an operation done by an operator; reading one of a plurality of mixer configurations from a storage; displaying or editing the read mixer configuration within a scope permitted by the user authority with which the mixer engine control program has been logged on; and writing the edited mixer configuration to the storage; wherein the storage may store a protected mixer configuration created and supplied by a vendor, such that the mixer configuration created by the vendor is protected with a vendor authority higher than the plurality of the user authorities with which the user is able to log on the mixer engine control program, and wherein when the mixer configuration protected with the vendor authority is supplied, the supplied mixer configuration is protected against displaying and editing of the mixer configuration in the step of displaying or editing if the mixer engine control program has been logged on with any one of the plurality of user authorities.