H/P Box; Midi Learn; Footswitch; Dim Settings - Solid State Logic Sigma Delta User Manual

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. 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 page to select an ipMIDI port for Sigma to receive MIDI CC messages through.
Follow the on-screen instructions to learn/un-learn functions.
Assignable MIDI Learn functions include:
• ROTARY LEVEL ENCODER
• LEVEL SOURCE CYCLE
• ALT L/S
• MONO

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 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.
• CUT MONITORS
• DIM MONITORS
• T/B
• MONITOR SOURCE CYCLE
• H/P SOURCE CYCLE
• INSERT A
• INSERT A SUM
• INSERT B
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• INSERT B SUM
• MIX B TO MIX A
• METER SOURCE CYCLE