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H/P box
The
H/P
box on the front panel indicates which sources are feeding the headphones on both the front panel 1/4” jack
output and the line-level output on the rear panel D-Sub connection. This may be any combination of
mIX A
,
mIX b
or
eXT
.
Sigma’s talkback input can be switched on/off with the
T/b
button in the web browser. The talkback input is routed to both
the front panel 1/4” headphone output and the rear panel line-level feed. Talkback is injected
post the H/P level control
,
so you will need to use the output level of your talkback mic’s preamp to control the overall talkback level.
Sigma does not include an internal talkback preamp. The T/B input is line-level input from which you should connect
the output of the external preamp you are using with your talkback microphone.
The line-level headphones feed provided on the rear D-Sub provides a useful method of running the headphones feed
into a separate live room/vocal booth. Typically, you would connect this into a cue mixer system, which the artist
would plug their headphones into. The level of the headphone signal is controlled by selecting H/P in the Level Box
and using the rotary encoder to adjust accordingly.
mIDI LeArN
Clicking the
LeArN
button beneath the MIDI icon activates Sigma’s MIDI Learn mode.
LeArN
allows
you to use CC messages (generated by a CC MIDI control surface) to control various functions on the
mASTer
page. This is useful if Sigma is installed into a remote rack outside your immediate reach.
Use the
SeTTINGS
of the web browser to select an ipMIDI port for Sigma to receive MIDI CC
messages through.
Follow the onscreen instructions to learn/un-learn functions.
Assignable MIDI Learn functions include:
FooTSwITCH
On the rear panel of Sigma you will find a footswitch input, suitable for a 1/4” on/off (latching or
non-latching) footswitch. SSL tested with a Digitech FS300 (non-latching) and a standard Marshall
guitar footswitch (latching). By default, the footswitch is assigned to turn the talkback talkback
input on/off although this can be changed to any of the options available in the drop-down box.
DIm SeTTINGS
T/b DIm (for Headphones)
- When talkback is engaged, the
T/b DIm
level sets the amount of
attenuation applied to the currently selected
moNITor
source(s) in the headphones. A setting of
0dB will apply no attenuation and therefore simply sum the talkback input with the monitor
sources. A setting of -∞ will apply maximum attenuation, completely muting the monitor source,
leaving only the talkback input.
moN DIm (for control room)
- Sets the level of DIM for the control room monitors, when the
DIm
button is engaged.
iJack Input
The bottom-right of Sigma’s front panel provides a 1/8” stereo jack input for connecting consumer products such as
iPods. This input can be sent to the control room monitors or headphones by selecting
eXT
(External Input).
If you wish to connect the output of a professional line-level source such as a CD player, there is a stereo external input
available on the rear panel D-Sub connector. This will be summed with the front panel iJack input. See Appendix A
for connection/pinout details.
• ROTARY LEVEL ENCODER
• LEVEL SOURCE CYCLE
• ALT L/S
• MONO
• CUT MONITORS
• DIM MONITORS
• T/B
• MONITOR SOURCE CYCLE
• H/P SOURCE CYCLE
• INSERT A
• INSERT A SUM
• INSERT B
• INSERT B SUM
• MIX B TO MIX A
• METER SOURCE CYCLE
