From the manual, USB AUDIO section:
Recording a Dry DI Track
For this example, we’ll record guitar into two DAW tracks simultaneously, with one capturing the Helix-processed tone and the other the unprocessed DI guitar.
1.
In the Helix Global Settings>Ins/Outs>Page 3 screen, set Re-amp Src (USB 7) to “Guitar” (as shown above).
2.
Dial in your desired Helix tone, while keeping the Helix Input and Output blocks both set to the default “Multi” setting.
3.
Create two new audio tracks in your DAW software project:
Create one mono track to record the dry DI guitar, and set the track’s input to Helix USB 7.
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