The rotary switch MODE controls the internal input and output matrix stages. Since the
input and output format can be switched in and out it is possible to integrate
the module into a M/S processing chain with several M/S modules.
The MODE switch determines the input and output format. In the L/R position,
both matrix stages are active and the input and output format is L/R. IN selects
operation with M/S input and L/R output format, while OUT selects L/R input and
M/S output format. I/O bypasses both matrix stages and selects M/S format for
input and output. The blue MODE-LED indicates any format selection but L/R for
input and output.
With the standard factory setting, the bypass
switch is a relay hard bypass that affects the M/S equalizer and the input and
output matrix stages. This setting is practical if the module is used either
with L/R or M/S input and output signals. If the module is integrated in a M/S
processing chain, e.g. in combination with the M/S
Mastering Compressor TM132
, and either the input or the output of the
M/S equalizer is used to convert or reconvert the format from or to L/R, the
standard setting of the bypass switch results in an unwanted format conversion.
The alternate setting keeps the matrix stages always in the signal path and the
bypass switch only affects the M/S equalizer. However, the matrix switch is always
functional and can be used to select the input and output format. The
setting can be changed by jumpers at any time.
If the mode switch is in the I/O position but the input and output format is
L/R, the equalizer operates in stereo mode - which is not intended or really
useful but possible; e. g. for generating a pseudo stereo signal from a mono
source. In this case the boost/cut pots for the M channel affect the left channel
and the boost/cut pots for the S channel affect the right channel. Please note
that due to the base width related orientation, left-hand rotation of
the M pots results in boost while left-hand rotation of the S pots results in