default or selected kernelversion does not have config value CONFIG_LINE6_USB_IMPULSE_RESPONSE.
Result is shown for kernelversion 6.5.1

measure impulse response


Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Line6 USB support
└─>measure impulse response
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
Say Y here to add code to measure the impulse response of a Line6
device. This is more accurate than user-space methods since it
bypasses any PCM data buffering (e.g., by ALSA or jack). This is
useful for assessing the performance of new devices, but is not
required for normal operation.

If unsure, say N.