Virtual Send Bus Mix Matrix - Extron electronics DMP 128 User Manual

Virtual Send Bus Mix Matrix

The DSP architecture contains a Virtual Send Bus mix matrix that connects the inputs and
virtual bus return signals to the virtual sends. There is an additional mix matrix to route EXP
input signals to the virtual sends.
The DSP Configurator main screen provides control of the virtual bus mix matrix, used to
set levels from input signals to the virtual sends. Each of the twelve mic/line and eight virtual
return inputs are connected to a mix-point for virtual bus A through H (and the EXP inputs).
Each mix-point is muted and set to 0.0 dB (unity gain) by default. In general, mix levels are
set relative to each other, achieving a desired blend of input signals at an optimal level close
to, but not exceeding 0 dBFS at the output volume level meter.
The virtual mix matrix contains a section (see figure 48) that allow the virtual bus returns
to be routed back to the virtual bus matrix for further processing using an additional virtual
bus processing block. To prevent feedback loops, a virtual channel is prevented from being
routed back to itself by eliminating the mix-point that would allow that to occur.
In situations requiring extra processing, the virtual bus return output is routed back to the
virtual bus send mix matrix, which then routes the signal back to a processing signal chain
other than the one it was routed from.
Figure 48.
A
Virtual Send Bus Mix-points
(from Mic/Line Inputs)
B
Virtual Send Bus Mix-points
(from Virtual Bus Returns)
C
EXP Inputs to Virtual Bus
Sends
Virtual Bus Mix Matrix (EXP inputs 9-16 not shown)
Virtual Send
Bus Mix Matrix
DMP 128 • Software Control 77