You can create a dac~ object with one or more logical channel numbers between 1 and 1024. Logical channels are assigned to audio device channels using either the Audio Status window, its I/O Mappings subwindow, or an adstatus object (with keyword ). If the computer's built-in audio hardware is being used, there will be two output channels available. Other audio drivers and/or devices may have more than two channels. If no argument is typed in, dac~ will have two inlets, for input channels 1 and 2.
If a symbol is provided as the first argument to a dac~ object, its output will be sent to the Max mixer. If dac~ instances in a patcher hierarchy share the same name they will use the same mixer output.
Common Box Attributes
Note that if the audio is on and you use the message to change a dac~ to use logical channels that are not currently in use, no sound will be heard from these channels until the audio is turned off and on again. For example, if you have a dac~ object with arguments 1 2 3 4 and signals are only connected to the two leftmost inlets (for channels 1 and 2), the message will not immediately route the leftmost audio signal to logical channel 3, because it is not currently in use. A method to get around this is to connect a sig~ to each channel of a dac~ you plan on using for a message. At this point, you might as well use a matrix~ or selector~ object to do something similar before the audio signal reaches the dac~.
dac~ produces no output internal to the application. Signals received in its inlets are sent to its assigned logical audio output channels. You can assign logical channels to device output channels in the I/O Mappings subwindow of the Audio Status window.
|MSP: Audio Input and Output||MSP: Audio Input and Output|
|MSP Basics Tutorial 1: Test Tone||MSP Basics Tutorial 1: Test Tone|