Helix Models
This is the most comprehensive list of models and blocks that you can find for every amp, cab, distortion, modulation, pitch, and other effects found on the Line 6 Helix, Helix Rack, Helix LT, HX Stomp, HX Stomp XL, HX Effects, and Helix Native.
Volume/Pan: Stereo
Found 5 stereo models.

Volume
Based on: Line 6 Original

Gain
Based on: Line 6 Original
Pan
Based on: Line 6 Original
Stereo Width
Based on: Line 6 Original (utility to collapse stereo paths)
Stereo Imager
Based on: Line 6 Original
Firmware version: 3.00