Extron electronics DMP 128 User Manual page 84

In the example in figure 49 below, input 1 is sent to the virtual send bus by muting all eight
signals on the Input 1 output mix-points and unmuting virtual send bus output 1. The
virtual bus now serves as additional signal processing for the input. The signal routes from
virtual send A through the virtual bus A signal chain before it is sent to the virtual bus return
mix-point and finally to output 1.
This configuration is useful when more than one input requires identical processing. For
example if all inputs were normalized but required a uniform gain to bring them up to
adequate output levels, rather than changing each pre-mix gain control by a similar amount,
all twelve inputs can be routed to a virtual bus (in this case virtual bus A). Then, using the
virtual bus A return gain control, a single adjustment can apply the same gain to all twelve
inputs before sending the signal to the desired output.
In other cases, when multiple mic inputs are mixed with program material, only the program
material might require loudness contouring. So the mics are routed directly to the output but
the program material input is routed to the virtual bus return where loudness contouring is
applied. The program material is then routed to the same output as the mics.
Figure 49. Input 1 to Virtual Bus A
DMP 128 • Software Control 78