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Lexicon FX Processor | Soundcraft Signature Plus Series

Video Manual Series


Written by Felipe Guerrero

Updated at September 22nd, 2026

Learn how to use the built-in Lexicon FX processor on the Soundcraft Signature Plus Series of mixers. In this video, we’ll show how the FX knobs on the input channels can be used to create an effects mix that is sent to the internal Lexicon processor and returned so the effects can be heard in the main mix.

You’ll learn the basic controls available in the FX section of the mixer, including how to select from the 32 classic Lexicon effects such as reverb, delay, chorus, flanger, and more. This video also covers how effect parameters can be adjusted and stored, giving you more control over the sound of your mix.

We’ll also explain how external footswitches can be connected to control features like Tap Tempo and FX Mute, making it easier to manage effects during live performances, recording sessions, and other real-world mixing applications.

 

Transcript
Hello, my name is Tony Smith and welcome back to the Soundcraft Signature Plus Video Manual Series. In this video, we’re going to talk about the built-in Lexicon FX Processor. These mixers come with 32 different classic Lexicon effects, parameters to control, and even the ability to save presets. 
You can think of the FX processor like an aux mix. Each input channel has a blue FX knob that adjusts the amount of channel signal that can be sent to the FX processor. You can then adjust the level of that mix being sent to the FX processor, mute or monitor it, and insert the talkback mic signal here in the outputs section. 
This blue fader is for the FX return, or the signal that is coming back post-processing. Once you have an FX mix being sent to the processor, make sure this channel is being sent to a bus like our main mix. Then, increase the fader to hear the FX in the mix. 
This FX section of the mixer is where you can select and customize your FX. Use this knob to select which effect you want, then use these three knobs to shape the sound to your liking. 
If you’ve found a combination of parameters that you like, you can store them using this button here. When the parameters are stored, these lights to the side of the knobs will be lit to indicate that the knob matches the stored parameter. If you adjust the knob, the light will go away until it is back in stored position, or until you overwrite the stored parameters. 
This processor has a tap tempo button available for time-based FX here. There’s also two footswitch connections here with the outputs for a tap tempo or FX mute switch. These connections support normally open switches and the mute will bypass the FX for as long as the switch is closed. 
In the next video, we’re going to cover the talkback mic input. Thanks for watching. For more news, product information, and troubleshooting tips, visit our Anytime Help Center at Help.Harmanpro.com

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