default or selected kernelversion does not have config value CONFIG_LINE6_USB.
Result is shown for kernelversion 6.5.1

Line6 USB support

modulename: line6usb.ko

configname: CONFIG_LINE6_USB

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Advanced Linux Sound Architecture
└─>Line6 USB support
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This is a driver for the guitar amp, cab, and effects modeller
PODxt Pro by Line6 (and similar devices), supporting the
following features:
* Reading/writing individual parameters
* Reading/writing complete channel, effects setup, and amp
setup data
* Channel switching
* Virtual MIDI interface
* Tuner access
* Playback/capture/mixer device for any ALSA-compatible PCM
audio application
* Signal routing (record clean/processed guitar signal,

Preliminary support for the Variax Workbench and TonePort
devices is included.

source code: