Figure 2-3a. PM4000 Master Module
(matrix section of module)
2.1.3 The Master Module (1 - 8)
These eight modules are identical, except that each
controls a differently-numbered set of Group Master,
VCA Master and Matrix Output channels.
MATRIX SECTION
28. SUB IN
This rotary control adjusts the level of the signal
from the MTRX SUB IN connector applied to the
module’s MTRX OUT. MTRX SUB IN 1 is applied
only to MTRX OUT 1, MTRX SUB IN 2 to MTRX
OUT
2,
and so forth.
29. LR (Matrix mix level controls)
These 2 rotary controls adjust the level of signal
from the left and right sides of the stereo mixing
bus applied to the module’s MTRX OUT. Signal is
available for this mix only if there something has
been assigned to the stereo bus, either directly
from the input modules’ ST switches [3], or
indirectly via the GROUP TO ST switches [40].
30. 1 2 3 4 5 6 7 8 (Matrix mix level controls)
These 8 rotary controls adjust the level of signal
from the correspondingly numbered group mixing
busses applied to the module’s MTRX OUT.
There will only be signal available, however, if
the correspondingly numbered master modules’
GROUP TO MTRX switch [41] is engaged. The
signal applied to the matrix mix is nominally
derived post-group master fader, but an internal
jumper switch in each master module permits
this to be changed to a pre-group master fader
signal.
31. MTRX MASTER
The Matrix Mix level controls [29, 30] permit a
mono mix to be derived from the eight group
busses and the stereo bus, while the SUB IN
control adds an additional signal to the mix. The
MTRX MASTER control then sets the overall
level of this 11-source mix just before it is routed
to the matrix output connector.
32. INSERT (Matrix insert)
The matrix circuit has an insert Out/In patch
point located just before its master level control.
The OUT jack is always active. If this switch is
engaged (LED illuminated), the IN jack becomes
active. Thus, engaging the INSERT switch can
insert a signal processor in the matrix channel, or
it can substitute an external line-level input
instead of the mixed matrix signal.
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