Signal routing and mixing matrix (multichannel I/O) matrix~ is an array of signal connectors and mixers (adders). It can have any number of inlets and outlets. Signals entering at each inlet can be routed to one or more of the outlets, with a variable amount of gain. If an outlet is connected to more than one inlet, its output signal is the sum of the signals from the inlets.
When the matrix~ object is created as mcs.matrix~ all of its signal inlets are combined into a single multichannel inlet and all of its signal outlets are combined into a single multichannel outlet. The behavior of mcs.matrix~ is otherwise identical to matrix~. Cycling '74 MSP Input, connect (list), disconnect (list), ramp (int), clear TEXT_HERE Input, connect (list), disconnect (list), ramp (int), clear TEXT_HERE Output TEXT_HERE inlets outlets gains TEXT_HERE Number of inlets The first argument specifies the number of inlets. Number of outlets The second argument specifies the number of outlets. Default gain for connections If a float value is provided as a third argument, it sets a default gain to be used for the connect message when a gain argument to connect is not supplied. Connect inlets and outlets In left inlet: A list of three numbers connects inputs and outputs. The first number specifies the input channel, the second number specifies the output channel. If the third number is 0, the input is disconnected from the output. If the third number is non-zero it is interprted as a gain for the connection between the input and output.

Note: To specify the gain of individual connections, you must use three-element list messages rather than the connect message. Connections formed with the connect message always have a gain specified by the third argument initially given to the mcs.matrix~ object. However, subsequent list messages can alter the gain of connections formed with the connect message.
The addition of an optional fourth element to the list message can be used to specify a ramp time, in milliseconds, for the individual connection. Example: 1 2 .8 500 would connect the first input to the second output and specify a gain of .8 and a ramp time of .5 seconds). Remove all connections In left inlet: The word clear removes all connections. Connect an inlet to an outlet In left inlet: The word connect, followed by one or more ints, will connect any inlet specified by the first int to the outlet or outlets specified by the remaining ints in the list. Inlets and outlets are numbered from left to right, starting at zero. For example, the message connect 0 0 1 would connect the first inlet from the left to the leftmost outlet and the second outlet from the left. If the last item in the list is a float, it will set the gain for all specified connections. Configure the state of mcs.matrix~ with a dictionary The mcs.matrix~ object can receive dictionaries to configure its state. When receiving a dictionary, all previous connections are cleared and replaced by the connections in the dictionary. You can also set some attributes with a dictionary, including the default gain and ramp time. Disconnect an inlet from outlets In left inlet: The word disconnect, followed by one or more ints, will disconnect any input specified by the first int to the output or outputs specified by the remaining ints in the list. Send connection information out the right outlet In left inlet: The word dump causes the current state of all mcs.matrix~ object connections to be sent out the rightmost outlet of the object in the form of a list for each connection. The list consists of two numbers which specify the inlet and outlet, followed by a float which specifies the gain for the connection. Note that the current gains are not necessarily the same as the target gains of all matrix~ object connections, since a connection's gain can ramp to its new target over time. Send connections out the right outlet as a dictionary In left inlet: The word dumpconnections causes the current contents of the matrix~ object to be sent out the rightmost outlet of the object as a dictionary. Send target state information out the right outlet In left inlet: The word dumptarget causes the target state of all mcs.matrix~ object connections to be sent out the rightmost outlet of the object in the form of a list for each connection. The list consists of two numbers which specify the input and output, followed by a float which specifies the target gain for the connection. Note that the target gains are not necessarily the same as the current gains, which can be accessed with the dump message. Print a connection list to the Max Console In left inlet: The word print causes the current state of all mcs.matrix~ object connections to be printed in the Max Console in the form of a list for each connection. The list consists of two numbers which specify the input and output, followed by a float which specifies the gain for the connection. Output Count TEXT_HERE Ramp Time (ms) Sets the ramp time in milliseconds, switching signals without creating audible clicks. Connections between inputs and outputs can have their own gains, and each connection can include a ramp time to avoid clicks. The output signals for each outlet are the sum of their connected inputs, scaled by the gain values of the connections. Out right outlet: A set of lists describing the current or target state of all matrix~ object connections will be sent out the right outlet in response to a dump or dumptarget message.