C
OMREX
C
ORPORATION
44
STAC Product Manual
45
Finally, the STAC provides an
Auto Mix-Minus
function which can provide
some utility. Due to its limitations, use of this mode is discouraged. By
setting
DIP Switch 8
on the STAC mainframe to
ON
, you can apply a full
program feed to the STAC, including caller audio. The STAC will attempt to
dynamically remove each caller from his outgoing feed. This adaptation re-
quires a completely unprocessed and linear signal at the
Send Input
, like
that coming directly off the console. Any clipping or dynamic range pro-
cessing done in the console will produce distortion in this process. Also,
there is some time required for the
Auto Mix-Minus
generator to adapt,
so the caller may hear some echo at the beginning of a call. Finally, if the
caller level is adjusted during the call (via the fader) the auto-mix minus
will need to re-adapt to the call, providing more echo.
In this mode, you can simply bridge the
On Hold Input Audio
to the
Send Input
as shown in Figure 6, since these are likely the same signals.
Figure 6 - Using Auto Mix-Minus
For studios that require multiple mix-minus feeds, such as for multiple
remote sources like codecs, the Comrex Mix-Minus Bridge can be used
to build up to five discrete mix-minus signals. For more information, see
http://www.comrex.com
.
O
PTION
E - U
SING
A
UTO
M
IX
-M
INUS
F
EATURE
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To Air Program
Out
Send In Hold Audio In Aux Out Hybrid 1 Hybrid 2
Out Out
