Digitech GNX4 Dry Guitar Audio Signal Configuration Via USB

13 May 2020 – Written by Michael R. Myers

In this post, we’ll look at how to make use of the GNX4 dry guitar signal audio in home recording.

The Digitech GNX4’s configuration options allow for some very flexible audio output combinations. One of the most useful functions is to configure the USB 1-2 channels to send your complete output (amp, cabinet and effects on channel 1) and your GNX4 Dry Signal (DI) on USB 3-4 simultaneously to your computer’s recording software. With some minimal configuration in your DAW, you can record both channels’ outputs and store them for safe keeping and future modifications.

Why use a dry guitar signal?

This article lists a few of the best reasons why it’s worth your time now, and for the time you need it in the future. Remember, capturing the dry signal in the present may not seem like it matters, but if you need to re-amp or switch out a virtual amp in the future, having that saved DI will make completing your project much, much easier on you and/or the musicians whose work you are producing.

If you have a copy of Craig Anderton’s Power User’s Guide for the GNX4, this information is presented nicely on page 58 of Chapter 8 – Routing and Recording.  The purpose of this configuration is to set up the GNX4 to send the effects audio as mono on USB 1-2 and the dry guitar signal as mono on USB 3-4 simultaneously. 

Configure your GNX4’s Audio Output Now

  1. On the recorder section of the GNX4, press the Shift button
  2. Press the CF/USB 1-2 SRC button
    GNX4 USB1-2 SRC button
  3. Turn the Data Wheel until you encounter MONO ALL
    GNX4 CF/USB button
  4. Press the CF/USB 3-4 SRC button, which is to the right of the CF/USB 1-2 SRC button
  5. Turn the Data Wheel until you encounter DRYGUITAR
    GNX4 USB 3-4 button
  6. Press Shift to close the configuration mode

At this point, your GNX4 is configured to send mono effects on the first USB channel (1), and its mono dry guitar on the second USB channel(2) . In your DAW, you will have to figure out how to separate channel 1-2 and channel 3-4 as separate inputs so that you can capture each one to its own track. And remember to arm both tracks EVERY time you record so that your effects and DI tracks match!

A final note is that you will most likely need to adjust the levels of the USB channels at some point so that the audio is not too soft or so loud that it causes clipping.  The procedure is similar in that you would press Shift, and then the individual Channels’ buttons that are one row below the SRC buttons you just configured.

If you would like to add to this content to help other folks, please contact me and let me know what you have in mind.