CONFIG_SND_USB_LINE6 (not configurable)

modulename: snd-usb-line6.ko

configname: CONFIG_SND_USB_LINE6

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>USB sound devices
└─>SND_USB_LINE6
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
sound/usb//line6/