A wildcard character ('*') can be used as the channel specifier for many of the channel commands. If
this is the case, there are two options for specifying the values for the channels. The first method is to
specify a single value that will be applied to all the channels.
Using the wildcard character for channel commands is not common on the EF2201, since it has only
one input channel and one output channel. The wildcard character for channel commands is generally
more useful on devices with multiple inputs, such as the EF2280 and EF2241.
6.4. Matrix Commands
Matrix commands are used for controlling parameters that exist at the crosspoints of the mixing
matrices. Typical parameters include gain and mute. Before describing the matrix commands, it is
necessary to give a description of the matrices involved. During the following discussion, it will be
helpful to refer to the figure below, which shows all the matrices with their input and output labels.
The EF2201 has only one physical output, which is the telephone output, labeled T.
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