Sigma Delta

Remote Controlled Analogue Summing

RRP: £3,149.17 + VAT

Designed for the DAW user that seeks the legendary big sound of an SSL console while retaining the convenience of working in the box, Sigma δelta is a unique rack mounting SuperAnalogueTM mixer with full tri-directional remote control and automation.

Sigma δelta seamlessly brings the analogue joy of mixing on an SSL console into your DAW dominated workflow. Using MDAC technology unique to SSL, Sigma takes the SuperAnalogueTM mix buss from SSL's Duality and AWS consoles and delivers it in a 2U rack design, with complete remote control of the analogue signal path, using either a hardware control surface and/or a simple Remote Control Application, and/or directly from your DAW using the innovative SSL δelta-Control (δ-Ctrl) plug-in. Now anyone who can drive a DAW can mix on an SSL.

Consistent feedback from the world's leading producers demonstrates that analogue summing still brings a record together in a special way that no emulation plug-in can match. Sigma δelta and SSL's no-compromise approach to designing audio circuits, delivers summing with an extended low-end frequency response, wide stereo imaging, clarity, depth and detail. When it comes to sonic tone and character many leading engineers state that a significant part of their 'sound' is the magic that happens when you drive the analogue mix buss of a console a little too hard...that delicate cohesive distortion only a pushed analogue mix buss brings their mixes. This is exactly the case with Sigma. It is at its best when pushed to that "sweet spot", to the point where it yields that extra sonic dimension which has always been part of the legendary SSL sound.

Sigma δelta combines its true analogue tone and depth with complete integration into a DAW dominated workflow. In today's commercial environment, fast turnaround of productions, with multiple mix tweaks and revisions, engineers and producers depend upon instant recall of all their settings. Sigma meets this demand. As Sigma's levels are driven from your DAW, the mix recalls instantly upon session load. Furthermore, every setting on Sigma itself (mix buss routing, monitoring section and settings) can be saved and recalled at the click of a button.

Sigma’s versatile dual mix buss, individual direct output and insert architecture also provides a streamlined means of applying analogue signal processing within your DAW workflow and simplifies printing processed material back to your DAW.

Sigma δelta also features a dual output studio monitor and headphone switcher and talkback system which is completely remote controllable. Sigma is setup from a cross platform Remote App that offers full standalone control of Sigma δelta. Running on a Mac, PC, or IOS tablet the app also performs as a superb remote control for the monitor switcher/talkback.

Sigma can also be controlled from any 16 fader MCU compatible control surface. MCU control can be used independently or in conjunction with the Remote app and D-Ctrl. The use of MCU control of Sigma facilitates direct control over the Sigma analogue mix path and monitor switcher from SSL’s Nucleus DAW controller or any other Ethernet equipped MCU enabled hardware control surface. Sigma’s MCU control requires no DAW software to be active, neither is there any requirement for the App to be open or even for a PC to be running. MCU control simply requires a 16 fader MCU compliant surface to be connected via a Network cable to the same DHCP server or router that Sigma is connected to. The Nucleus/Sigma fusion becomes a fully integrated 32 into 4 automated line mixer, with full monitoring and talkback capabilities. Sigma can also be used in combination with Duality, AWS and Matrix to add additional automated mixing capacity. Inserting Sigma δelta across the insert points of an XL desk, instantly adds automation to the console.

Third party controllers with MCU emulation will also function but channel banking is not supported at this time so a single 8 fader controller can only access the first 8 channels. Writing automation from an MCU Control Surface connected to Sigma is not supported with Logic Pro.

  • Advanced δelta-Control automation driven SSL SuperAnalogue™ mix engine
  • Works with all major DAW's including Pro Tools, Logic, Cubase/Nuendo, Ableton Live
  • 16 flexible channels individually switchable between stereo or mono for up to 32 channels at mixdown
  • 2 stereo mix busses with individual stereo insert points
  • Independent Main and Alternate Monitor outputs
  • Direct outputs on all channels
  • Talkback facility with adjustable Dim level
  • Intuitive cross platform Remote control app
  • High speed 'Logictivity Control' via single Ethernet cable
  • Full MCU hardware control surface support

Sigma is powerful and very flexible.

It has 16 input channels which can be individually switched between being mono or stereo for up to 32 channels at mixdown. There is accurate metering for all channels via LED meters on the Sigma hardware unit and within the software browser. There are two stereo mix busses with dedicated outputs and individual stereo insert points to facilitate implementation of parallel compression or convenient printing of stems back to the DAW with processing applied. Mix Bus B can also be injected into Mix Bus A for final mixdown. Providing further flexibility, Mix Bus A & B inserts also include an 'insert sum' feature to sum the insert return to the mix bus.

Each input channel also features an individual direct output for printing individual channels back to your DAW. The inclusion of direct outputs streamlines integration of your selection of analogue processing into your setup, with a typical configuration connecting DAW I/O output to outboard processor input, then processor output to Sigma input and Sigma direct output back to the DAW I/O. Unlike "dumb" analogue summing boxes, with this configuration, the gains of each channel on Sigma are automatable POST the outboard processors. This means that you no longer suffer the effects of riding into outboard compressors with each volume change inside the DAW. In addition, this setup removes all the phase problems caused by sample rounding on converters when using hardware inserts to integrate analogue outboard.

An Artist and Studio monitoring section provides separate Monitor and Headphone circuits. The Main monitor output has Main and Alternative connections to accommodate 2 sets of monitors. A comprehensive switching matrix enables selection of monitor source and output. A large front panel level control uses a push-select mechanism to determine whether it adjusts Mix A, Mix B, Main Monitor or Headphone. There is also a Talkback input with adjustable Dim level. A handy front panel ijack input (3.5mm stereo socket) feeds into the monitoring section.

Switching of a wide range of functions including, monitor level and source, inserts, talkback, sum B>A and mono check can all be achieved using any standard MIDI hardware control surface. A MIDI learn feature makes setup simple and easy. A pair of user assignable dual action push/hold buttons on the front panel or a foot-switch can be assigned to the same collection of switching functions. Sigma uses MIDI over Ethernet for control and to connect to a cross platform software interface which provides additional control and setup capability.

The Sigma rack unit houses the analogue summing engine, provides connectivity, a set of bright status and level LED's, hardware controls, headphone socket and ijack input. The rear panel provides dedicated XLR connections for the Mix Bus A and the Main and Alt monitor outputs. The individual line inputs and direct outputs are connected via standard 25pin D-Sub. An additional pair of D-Sub connections handle Mix Bus inserts, Mix B output and line level Talkback input.

The Sigma software interface makes setup, control and recall of saved settings simple and easy. It runs on Mac, PC or tablet device and connects to your workstation via Ethernet (or wirelessly from a tablet). The user interface provides a series of intuitive pages that make setting up Sigma's powerful feature set straightforward. Three main screens provide control and setup of the Master Section, Channel Detail and Global Settings parameters. Every parameter can be saved for future recall making swapping between projects simple and efficient. Pan control for stereo channels cannot be automated but it can be controlled from the browser.

Setup Concepts

Sigma communicates with your computer a little differently to what you may be used to... it is worth reading this, all of which is covered in detail in the User Guide, before setting up.

Sigma is an analogue summing unit which can be controlled remotely using MIDI control and automation data from a DAW or a Hardware Control Surface.

Sigma uses a an application called 'IP MIDI' which runs on your computer and lets you use a standard Ethernet cable connected between your computer and Sigma to carry MIDI information. You need to install IP MIDI before you can use Sigma.

Sigma can also be remote controlled using a software browser. This browser is not a piece of software you install on your computer, it is actually a set of web pages which are hosted inside Sigma. You access those web pages using a standard internet browser such as Chrome, Firefox, Internet Explorer etc. To access the Sigma Browser 'software' you simply open a tab in your internet browser and type in a number (the IP Address of your Sigma unit). This address can be bookmarked like any normal web page.

Both the Sigma Browser and IP MIDI require that a network connection exists (via Ethernet) between your computer and Sigma. This is set up in a similar way to configuring a wireless hub and requires selection of appropriate settings in your network control panel in your computer.

To use a tablet/smartphone device (iPad etc) to control Sigma you will need a Wireless Router, to which your computer and Sigma are already connected (using physical Ethernet cables). You simply connect to your tablet via WI-FI your Wireless Router's signal. This allows you to connect to and control Sigma's web pages, in a tab within your web browser. This is necessary as Sigma does not have a wireless connection of its own.

The network and MIDI control aspects of Sigma are entirely separate to the audio side of Sigma. All audio connections are made between the Sigma unit and your Computer audio interface/converters.

SSL Sigma Product Tour

A short tour of Sigma, the Remote Controlled Analogue Summing System from SSL. Covers what it is, how it can help bring sonic depth and tone to your mixes and how it fits into your studio workflow.

SSLvideos SSL Sigma Product Tour